Usagi Tsukino is the Sailor Guardian of love and justice, Sailor Moon. Originally from a prosperous civilization on the Moon known as the Moon Kingdom, she was reborn on Earth and re-awoke as the leader of the Sailor Senshi.
Usagi and her younger brother Shingo live in a Tokyo home with their parents Kenji and Ikuko Tsukino. She leads an average life in Tokyo's Azabu-Juban district and attends middle schoolwith her friends Naru, Umino, Yumiko, and Kuri.
One morning she sleeps in and is late for school. She accidentally steps on a black cat, Luna, while en route. To apologize, she kisses the cat and removes a bandage on her forehead but receives a scratch and strange look in response. It is not a good day at school. She tries to throw her test paper with a 30% away but hits a high schooler, Mamoru Chiba, who tells her to study harder next time. Ikuko is not happy about the test result either and locks her out of the house. Eventually, Usagi is let back in and goes to her room, she takes a nap and dreams she is like the great Sailor V instead. Luna wakes her and starts speaking but Usagi doesn’t believe it and doesn’t listen until Luna gives her a brooch and tells her to say "Moon Prism Power, Make Up". This transforms her into a Sailor Guardian like Sailor V: Sailor Moon. Her new outfit and mask allow her to see her friend Naru being attacked by a monster targeting her and others for their energy. Luna informs Usagi it is her job to save her. Sailor Moon defeats the monster through her crying and Luna's directions. With the people saved, the handsome Tuxedo Maskappears and introduces himself before disappearing into the night leaving Usagi enamored.
Luna tells Usagi it is her mission to find the Princess and her fellow Guardians as she returns to her normal life. One day after school, Luna jumps on the cute school genius Ami Mizunoprompting Usagi to speak with her. She tries to befriend Ami, hoping she can help with her academics, by taking her to Crown Game Centerand playing the Sailor V game. Usagi does not do well, but Ami sets a high score winning a penwhile Usagi brute forces a pen of her own. Ami leaves to head to the Crystal Seminar to study. Over the next few days, Luna and Usagi learn the Seminar is another front of their enemy and is brainwashing students into looking for a Silver Crystal and stealing their energy. Usagi heads there to save Ami and the other students and in the process of killing the monster has another encounter with Tuxedo Mask and witnesses Ami awaken as fellow Guardian: Sailor Mercury.
While on a bus, Usagi spies a pretty girl, Rei Hino, getting off and follows her to Hikawa Shrine. She befriends the girl after a misunderstanding and learns of people going missing after catching a 6 pm bus. Mamoru Chiba catches Luna speaking again while she and Usagi return to the Shrine to investigate. They see Rei get abducted on a bus which disappears into another dimension. Sailor Moon and Sailor Mercury follow and see Rei awaken as Sailor Mars as all three work together to defeat Jadeite.
All three Guardians investigate a Masqueradebeing held by Kingdom D suspecting their treasure may be the Silver Crystal. Their enemies have the same idea and plan to crash the party and possess Princess D and steal the treasure. During the party, Usagi encounters Tuxedo Mask again and after their enemy's attack, he saves her. Sailor Moon gains a new tiara and saves the Princess with Moon Twilight Flash. They find the treasure is not the Silver Crystal.
While walking to school and talking to Luna, Usagi stops paying attention and affectionately thinks about Tuxedo Mask. She walks in front of traffic and is saved by Makoto Kino. Makoto is a new transfer student that everyone else tries to stay away from, but Usagi spends lunchtime with her and invites her to the arcade with Ami. They talk about a rumour of a Ghost Bride Usagi had heard earlier with Naru, Yumiko, and Kuri which curses people. All three head to Hikawa Shrine to talk to Rei about it. That night, the Ghost Bride targets Motoki and Makoto. While Usagi is asleep, Tuxedo Mask arrives at her window, wakes her up, and leads her to the Monster. Makoto awakens as Sailor Jupiter and she and the other three Guardians take down the Ghost Bride and Nephritewho is controlling the bride and possessed Princess D at the Masquerade. With four Sailor Guardians, Luna gives Usagi the Moon Stick and tells her she is the leader and it's her duty to protect the Silver Crystal and the Moon Princess.
Luna never told them they are protecting a Moon Princess from a Moon Kingdom and that she is from that Kingdom herself. Their enemies brainwash the populace, including Usagi, to look for the Silver Crystal. When Zoisite realizes nobody can find it he drains the energy of everyone mind-controlled. Tuxedo Mask finds Usagi collapsed in the street and wakes her up to tell her to transform into Sailor Moon and save Tokyo. Her new Moon Stick appears in her hand and she uses it like Sailor V did in the arcade game which restores everyone drained by Zoisite. Usagi faints from exhaustion and Tuxedo Mask carries her off and she feels something familiar. She awakens in Mamoru's bed and finds a broken pocket watch.
She learns Mamoru is Tuxedo Mask and he's looking for the Silver Crystal for a clue of his lost memory. Despite Luna's warnings she wants to trust him. As she is leaving, she accidentally takes the watch and he calls her "Usako" while Usagi decides to call him "Mamo-chan" and to keep the encounter secret. The Guardians find a wave of brainwashing videotapes that are coming from rental stores and people across the city are searching for Sailor Moon. The other Guardians and the enemy are impressed by the regenerative power Usagi gives off with her Moon Stick. They get a hold of one of the movies and bring it to the Sailor V game for analysis. The game appears broken before Sailor V appears on the screen to order Usagi to take action since people's lives are in danger. Sailor Moon uses her Moon Stick to heal the brainwashed crowds of people but Zoisiteappears and grabs her. Sailor Mars and Sailor Jupiter fail to save her and just before he kills her Artemis and Sailor Venus attack and destroy Zoisite.
Artemis introduces Sailor V as "Princess Serenity" the heir of the Silver Millennium who has a secret identity Minako Aino who is a fellow middle schooler. Kunzite of the Dark Kingdom targets all of Tokyo and the Guardians battle him at Tokyo Tower. Sailor Moon throws herself in front of an attack to protect the "Princess" and Tuxedo Mask does the same for her taking the fatal blow. In Usagi's grief, the Silver Crystal becomes unsealed, she remembers her past life, and takes the form of Princess Serenity. Queen Beryl and Kunzite kidnap Mamoru. Sailor Venus reveals she is the true leader of Serenity's Protectors and has been acting as a decoy princess until the other Guardians regained their memories. To learn more about the Dark Kingdom and Silver Crystal they head to the Moon.
There she sees ruins and meets a computerized Queen Serenity who tells the group about Queen Metalia and how the Silver Crystal's power depends on Usagi's own heart. Kunzite attacks Tokyo again and Sailor Moon restores the people while her protectors finish him. "Endo", a brainwashed Mamoru, appears at the arcadeleaving Usagi unsettled. He brainwashes Makotoand lures everyone to the Command Center where he attempts to take the Silver Crystal. Queen Beryl arrives to help but is killed by Sailor Venus who faints after the Holy Sword glows. Tuxedo Mask kidnaps Venus and escapes through a portal to D Point with Sailor Moon close behind.
Usagi finds he really isn't her Prince Endymion and attacks him with the Holy Sword and stabs herself and faints. She awakens inside Queen Metalia who is devastating the Earth's populace and finds she hit Mamoru's watch with the sword. Her Silver Crystal takes its lotus form which she uses to revive Tuxedo Mask and escape. With his support, she destroys Metalia. Her brooch shatters and she falls unconscious to be awakened by her Prince's kiss. She teleports them to the Moon which is no longer in ruins and speaks to Luna, Artemis, and Queen Serenity. She is given her Crystal Starbrooch that holds the Silver Crystal, transforms with Moon Crystal Power, Make Up, and uses Moon Healing Escalation to revive everyone on Earth including Ami, Rei, Makoto, and Minako whom she reunites with.
Later, she meets Mamoru in the park planning to return his watch but a portal in the sky opens and a small pink haired girl demands the Silver Crystal at gunpoint.
The gun is not real and after the situation calms down Mamoru and Usagi bring the chibi-Usagi to Usagi's house where she brainwashes Umino and Usagi's family into thinking she lives there. Usagi is not happy. Chibiusa even starts going to elementary school and in the short story Chibiusa's Picture Diary Chapter 1 - Beware of the Transfer Student Sailor Moon and Sailor V save the child from a vampire.
Not long after, a new enemy appears and abducts Rei, Ami, and Makoto one by one. The Black Moonis looking for Chibiusa but the child does not share information about herself or these new enemies. Eventually, Chibiusa steals Usagi's brooch with the Silver Crystal inside. Before Usagi can take it back Rubeus attacks but they are saved by Tuxedo Mask's Tuxedo La Smoking Bomber. Usagi snatches it back, transforms, and saves Venus from Calaveras with Moon Princess Halation. Chibiusa tells the three of them she is from the future and asks them to save the 30th Century.
The next day, they head to the future along with Artemis and Luna as Chibiusa uses her Space-Time Key. After traveling through the portal, they encounter the Door of Space and Time and its guardian Sailor Pluto. Pluto initially attacks Sailor Moon and the others seeing them as intruders, but she becomes friendly after Chibiusa speaks to her. Pluto asks them to take care of her princess as they leave. Usagi is shocked at the idea that Chibiusa is a princess. They see the destroyed Crystal Tokyo and, after Venus and Mamoru take down more Black Moon minions, reach the Crystal Palace.
Inside, they meet King Endymion, Diana, and see the sleeping Neo-Queen Serenity. Usagi is even more shocked and embarrassed to learn Chibiusa is her future daughter with Mamoru. After learning of Crystal Tokyo, Nemesis, and the Black Moon Clan from the King, they briefly return to the past as she and Mamoru spend too long near their future selves. Usagi is upset by Mamoru's prioritization and monopolization of Chibiusa and lashes out. The child returns to the Crystal Palace on her own and is attacked by Esmeraude. Venus and Mamoru save her, but Sailor Moon finds she can't use her power and is kidnapped by Prince Demande.
After an unpleasant encounter with the Prince, Usagi finds she is a prisoner at Nemesis and can't transform. While looking for Rei, Ami, and Makoto she encounters Saphir who attempts to kill her. She is saved by Neo-Queen Serenity who briefly possesses her and rescues her three friends. They all use a Space-Time Key to escape Nemesis. At the Door of Space and Time, Usagi learns Mamoru and Chibiusa have gone missing.
After a failed rescue attempt, the Guardians return to the future to find Black Lady, a brainwashed Tuxedo Mask, Wiseman, and the remains of the Black Moon clan. They save the future Earth through Pluto's self-sacrifice. Her death brings Chibiusa back to her true self and awakens her Silver Crystal. Sailor Moon and Sailor Chibi Moontogether, with Tuxedo Mask's help, strike down Death Phantom and her brooch and Moon Rodshatter. Neo-Queen Serenity grants her a Cosmic Heart Compact and has Chibiusa deliver a Heart Moon Rod to replace the broken ones and their future selves see them off as they return to the past for good.
As Chibiusa prepares to return to the future, neither girl is happy to lose the other and they say their goodbyes. From Usagi's point of view, Chibiusa returns almost immediately with a letter from Neo-Queen Serenity asking her to take care of the Sailor Guardian trainee.
A new school year has begun with Usagi and her friends in their last year of middle school. Usagi's dream of a wedding with Mamoru is interrupted by her alarm clock and is late for school. She is also late for her regular before school rendezvous with Mamoru and has his attention stolen by Chibiusaand Diana. She knows this time of peace won't last.
After school, she brings Naru to the arcade and meets with the other Guardians. Usagi is shown up at a racing game by the famous Haruka Teno - a student at Mugen Academy who leaves with the equally famous Michiru Kaio. On the street the Guardians witness a Mugen student transform into a monster and after Jupiter and Venus destroy it decide to investigate that school the next day.
Usagi uses her Disguise Pen to sneak inside and is lured by the sound of a violin. She finds Michiru who gives Usagi a stern warning about Mugen Academy and Usagi runs when security finds her. Usagi runs into Chibiusa with a sickly girl, Hotaru Tomoe. Another Daimon appears and the moon princesses transform and Sailor Moon uses Moon Spiral Heart Attack to destroy it. They all see two figures which look like another Guardian and Tuxedo Mask fly off into the night.
Usagi is confused why new Guardians would be avoiding them and secretly suspects they are Michiru and Haruka. The next day, Haruka appears at Crown Game Center and Usagi asks if Haruka is a Sailor Guardian. Haruka acts dumb and Usagi feels dumber for asking that to a guy and the Guardians interrupt warning Haruka to stay away. Days later, they decide to crash Rei's mountain retreat to celebrate her 15th birthday. That night, Ami and Minako wake Usagi up to a battle and she arrives just in time to destroy a monster Mars and Jupiter are fighting. Usagi spots the Guardian and chases after them this time and receives a kiss from the Guardian leaving Usagi confused on their identity and even has a dream about it. She has a hard time looking at Mamoru at the next morning's meetup.
After school, she sees Haruka at the arcade again and gives Usagi tickets to Michiru's upcoming concert at Mugen Academy and decides to take Ami, Rei, Makoto, and Minako to it where they encounter Mamoru and Chibiusa who had received tickets from Michiru. The concert abruptly stops and Minako tells them Mimi Hanyu is a Death Buster in another concert hall and to head there. With the witch destroyed, Sailor Uranus and Sailor Neptune introduce themselves and they learn they carry the Talismans they have been having premonitions about. The two Guardians deny working with them and attack Usagi knocking her out.
Around this time, Usagi celebrates a joint birthday party with Chibiusa during Chibiusa's Picture Diary Chapter 2.
While waiting for Mamoru, Haruka appears before Usagi again and gets close to her which deepens her confusion and Mamoru spots them. Mamoru and Usagi have been getting jealous of each other's encounters with the two new Guardians. Chibiusa diffuses the situation by having them spend time crafting a model Holy Grail with her. Usagi joins Chibiusa as she visits Hotaru, thinking it isn't safe, and while there Usagi meets Professor Tomoe and Kaolinite. As the pair head home, Usagi spots Haruka and Michiru and chases after them. She ends up at Haruka's apartment wanting to ask why they keep running and why they can't work together but is shut out. She meets back up with Chibiusa and the Guardians in investigating Mugen Botanical Gardens. There they encounter Telluwho is killed by a reincarnated Sailor Pluto.
Usagi takes her Princess Serenity form and the three Outer Guardians apologize and tells the others to leave the Death Busters up to them while remaining vague on their plans. On another night, a hail starts falling which drains the people of Tokyo of their energy. Usagi and the others spot the Outer Guardians fighting Cyprine and head there to help with Sailor Chibi Moon and Tuxedo Mask. Ptilol appears and the Witches brainwash the Guardians into fighting each other. Usagi, Chibiusa, and Mamoru combine their hearts which summons the real Holy Grail. With it they free the Guardians and all of them offer their power to it which allows Usagi to transform into Super Sailor Moon and obliterate the witches.
The Outer Guardians decide to share their plan. They plan to kill Hotaru and seal away Sailor Saturn before she can awaken and destroy the world like she did during the Silver Millennium. As they expected, Usagi strongly disagrees which justifies their reluctance to work with Usagi and her friends. Chibiusa runs off but she does not reach Hotaru rather a newly awakened Mistress 9who steals her Silver Crystal and soul. Everyone rushes her to the hospital and after they discuss and understand what happened Usagi and the others return to Mugen Academy for the final battle to save Chibiusa while the Outers plan to kill Hotaru who is now a Death Buster.
Usagi and the others are defeated by the revived Witches 5 but Sailor Pluto, Neptune, and Uranus save them. Usagi takes her Super form and destroys Kaolinite after Neptune locates her. The Sailor Guardians split up with Sailor Moon joining the Outers to the basement while the others check the higher floors. In the basement they find Professor Tomoe who turns into a monster and attacks. After finishing him, Sailor Moon hears Hotaru's soul mourning her father and they immediately escape as the building is destroyed. The others do not and Usagi loses her Super form.
As the Outers focus on containing Pharaoh 90who is trying to engulf the Earth, Sailor Moon is ineffective against Mistress 9 and watches as Hotaru sacrifices what's left of herself to save the others and Chibiusa. Usagi takes her Super form alongside Super Sailor Chibi Moon who awakens her own Holy Grail. When they all attack, they only strengthen Mistress 9 and Pharaoh 90 who then merge. With everyone else out of strength and Pharaoh 90 covering the Earth, Super Sailor Moon decides to take her Holy Grail and Silver Crystaland unleash their power inside of the darkness and dives in as everyone else looks on in horror.
She deals a mortal blow to Pharaoh 90. When she emerges, she triggers the Guardians to take their Super forms and the newly awakened Sailor Saturn sacrifices herself to dislodge it from the Earth and take Pharaoh 90 away from the planet. Usagi takes her Neo-Queen Serenity form and revives the Earth and its people. Pluto, Uranus, and Neptune find a baby and leave promising to return someday.
Through the rest of the school year the girls study for their High School exams which is shown in the Exam Battle stories. Sailor Moon, Sailor V, and Sailor Chibi Moon also exorcise a haunted cavity causing Dental Office in Chibiusa's Picture Diary Chapter 3 - Beware of Cavities.
On April 1st, the start of the next school year, Usagi celebrates her admission to Juban High School alongside Ami, Makoto, and Minako. She then leaves with Mamoru to see Chibiusa and Diana off as they are returning to the 30th Century. When the group arrives at the park, they see a crowd gathered to witness a solar eclipse. A Pegasus appears before them asking for help from a maiden and disappears. Usagi and Chibiusa each believe he is speaking to them.
Immediately after, the eclipse begins and the group spot a bizarre ship floating in the sky which announces itself as the Dead Moon Circus before vanishing with the end of the eclipse. Chibiusacannot head home with the large crowd, so they head into town. The girls guilt trip Mamoru into buying them matching kaleidoscopes and letting them sleep over. Usagi and Mamoru share a dream of Chibiusa riding around on that Pegasus and wake up to find she and Diana went to leave but the Space-Time Key doesn’t work. Instead, they investigate an escaped Dead Moon Circus Tigerand encounter PallaPalla and VesVes. In the conflict the girls regain the ability to take their Super forms and Helios turns their kaleidoscopes into weapons. As the new enemies retreat, Mamoru catches up to them and collapses. As Usagi and Chibiusa detransform, their ages are swapped.
They take Mamoru to the hospital and tell the Guardians what happened before little-Usagi accompanies Mamoru home. She gets an emergency call from Ami and arrives at Ami's Home with Chibiusa. When they transform the age reversal spell is broken. They finish Fish Eyetogether with Moon Gorgeous Meditation. Helios reappears before them and after Super Sailor Mercury suggests he is looking for Sailor Moon, or Princess Serenity, Chibiusa runs away. They find her after gathering everyone.
Everyone decides to investigate the Dead Moon Circus itself. Everyone, but Rei, Phobos, Deimos, and the cats, watch a show in the Big Top but it is a trap to drain the crowd's energy. Rei saves them and tells them what happened afterward. Mamoru becomes sicker. He becomes bedridden and misses school prompting Usagi to bring groceries to his home, but he tells her to leave soon after her arrival. Usagi gets Chibiusa to check on him next time worried it'll happen again. As they head home together, they notice Super Sailor Jupiterhad just killed another Dead Moon minion. Chibiusa's Crystal Carillon tells them Mamoru is in danger and the group rushes back to Mamoru's Home.
There they see Helios trying to protect Mamoru from Lemures which Super Sailor Moon destroys. Usagi finds Mamoru is hiding a terrible sickness from her. Helios takes a humanoid form and tells them that sickness is from a curse on him from the Dead Moon and about himself and their enemies while asking her to unseal the Golden Crystal. Usagi stays by Mamoru's side despite his reluctance.
Eventually, Mamoru's curse spreads to Usagi. Chibiusa heads to the Circus ahead of her when they realize the Outer Sailor Guardians have returned and are fighting there alongside the others. When she eventually arrives, Zirconia uses the curse to attack her and Mamoru but Helios appears and saves them. After a wonderful dream, she awakens in Elysion with Mamoru and Helios. Helios tells them how she and Prince Endymionprotected the Earth in their past lives with the Silver and Golden Crystals but doesn’t know where the later is as it has been sealed away. They will need it to defeat the Dead Moon. Usagi figures it is in Mamoru like the Silver Crystal was in her and he has been using it to support her all along. The two affirm their shared dream of protecting the Earth. As Queen Nehelenia notices them, they head back to the surface to protect the planet.
The surface has been covered in darkness and Helios has to use the rest of his strength to prevent the Guardians from passing out. Even then, Zirconia catches them all in a nightmare from which Tuxedo Mask frees everyone. Awakened, Usagi's protectors counterattack. Zirconia retreats into a mirror with only Super Sailor Moon able to follow. Inside, she senses planet power from stones and glass with Nehelenia standing in her way. Usagi's attacksphase through Nehelenia but she shatters when Super Sailor Jupiter smashes the mirror from the outside. Super Sailor Saturn takes the stones and they escape from the mirror world along with Super Sailor Chibi Moon. Reunited and noticing darkness continues to envelop the Earth, everyone teleports to Elysion looking for the enemy.
There they find the awakened Maenads and an unresponsive Helios before Queen Nehelenia arrives and taunts them. Super Sailor Moon attacks with Moon Gorgeous Meditation but it is reflected back at the group and traps them in a kaleidoscope dimension. They see a vision of the past when Princess Serenity is a newborn where the 4 Guardians meet and swear to protect her, and Nehelenia arrives as an uninvited guest who curses the Princess to die and the Silver Millennium to fall after Queen Serenity seals her away.
Usagi kisses Mamoru to take back her Silver Crystal, free them from the kaleidoscope world, and starts to create new power which manifests as the Holy Moon Chalice. The cats appear in their human forms and the other Guardians take their Princess forms. The Sailor Power Guardians appear and direct the other Guardians to send power from their castles to the Grail which upgrades Usagi into Eternal Sailor Moon who asks everyone to offer power to her Eternal Tiare. The Guardians call upon their Sailor Crystals and take their Eternal forms as Tuxedo Mask's Golden Crystal becomes unsealed. Eternal Sailor Moon uses the gathered strength to perform Starlight Honeymoon Therapy Kiss to obliterate Queen Nehelenia freeing Elysionand the Earth from the Dead Moon's curse.
After Eternal Sailor Chibi Moon revives Helios, he passes Mamoru his staff and he and Usagi take the forms of their future selves. Everyone attends the coronation of the King and Queen. Eternal Sailor Saturn asks Usagi to purify the four stones from earlier and from them the Sailor Quartetemerge before returning to sleep. On the surface, they say goodbye to Helios and Mamoru asks about the feeling he now has in his chest. Usagi tells him it's proof the star in his heart is shining recalling what Queen Serenity once told her.
Usagi and her friends return to a peaceful life which Setsuna, Michiru, Haruka, and Hotaru are now a part of. In The Secret Hammer Price Hall, Usagi takes Mamoru shopping to prepare for his upcoming trip to America to attend school. She later joins Hotaru and Chibiusa as her main protagonist status is threatened.
A few months later, Usagi is not happy about Mamoru's impending departure. She joins him at the airport to see him off.
In the Legacy of Chris Thorndyke,
And she is reprised by Stephanie Sheh in the English dub and Kotono Mitsuishi in the Japanese dub.