- "I have heard... your voices..."
—Usagi in the manga Chapter 22
Yuzuha Usagi is the heroine of Alice in Borderland. A skilled mountaineer thanks to her father but lost hope when he committed suicide. Her alias which means "rabbit" in Japanese refers the White Rabbit in Alice in Wonderland.
Usagi was troubled by social relationship since her childhood for not siding with the majority. When she attempted to please the 2 opposing groups of girls, she ended up being isolated by both sides. Usagi was physically capable when she was very young thanks to her mountaineer father and the 2 would climb together when he returned to Japan from oversea expedition. Usagi felt she could be liberated from the social affairs when she was enjoying her favorite sport and the view of nature from the mountaintop.
Her father decided he would challenge Mount Everest via an unexplored new route and without supplementary oxygen. His achievement unfortunately was widely regarded as a fraud and experts openly falsified the pictures he took during his expedition. Usagi's house was covered in hate graffiti. All these results of disapproval drove him to suicide. His last word was "I have never lied to the mountains". Grieving over her father's death and the invisible "social shadow" which claimed the only person comprehended her, Usagi saw the fireworks of the Borderland. Her immigration was special in that her body did not temporarily turn into a marionette.
Borderland: First stageEdit
While still kind-hearted, Usagi prefers to keep her distance from other people and lives alone. Because she used to camp in the wild when traveling for mountaineering, she has no trouble in catching and serving small animals which are living abundantly in the Borderland Tokyo.
Ryōhei Arisu and Daikichi Karube first meet her during the Five of Spades. She ventures the arena alone, but when she has heard Karube's appeal to loudly report Horse Head's position for other players, Usagi cooperates, which surprises Chishiya who believes humans are selfish. Usagi is already demonstrating her climbing ability which allows her to travel vertically between the apartment corridors without accessing the more dangerous elevator or stairways. Near the end of the game, she catches up to Arisu to trigger the game clear switches which require 2 players to synchronize. This scene differs slightly between the manga and OVA. In the manga, Usagi enters the lair before Horse Head, while in the OVA, Horse Head enters the lair after Arisu but before he can shoot Arisu, he is knocked down by Usagi.
She introduces herself to Arisu but turns down his invitation to come along, warns him that some game would require betrayal between players. After Arisu sorrowfully survives the Seven of Hearts sacrificing Karube, Chōta Segawa and Saori Shibuki, Usagi houses Arisu in her lonely camp. She is completely careless of the sexual implication between man and woman and allows Arisu to share bed in her tent. Arisu is sleepless for self-control in such embarrassing situation.
Following Chishiya's vague clue which is passed down via Karube, the two are looking for the "Beach" in hope of learning the truth of the Borderland. When they are greeted by the leader of the Beach, Boshiya, they begin to regret it but still decide to stay. When Arisu is apprehended for attempting to steal the Beach's cards, Usagi runs to his rescue, only to be caught as well and nearly raped by Niragi but halted by the announcement of Witch-Hunt. Asahi and Usagi are falsely accused of being the "Witches" and Boshiya's murderers. The now leader Aguni instead orders his underlings to kill all Beach residents. The panicking crowd gives chance for Usagi and Asahi to escape, Usagi then knocks down a member of Aguni's sect for Arisu's whereabouts, believing he can solve the trick behind the Hearts game. When she has saved Arisu, Usagi affectionately embraces him.
Borderland: Second stageEdit
During the intermission, Arisu confesses his determination to return to the original world with Usagi, but she hesitates, fearing she is unable to forgive the previous world and step forward like Arisu, her rejection deeply hurts him. Despite this, Usagi still accompanies Arisu to the King of Clubs arena with Kuina, Tatta and disgustingly Niragi. In an attempt to turn the table against the citizens' team, Usagi volunteers to bait one womanizing member of the opposing team but failure would mean instant death. She realizes her physical capability has significantly advanced because her life has been pushed to the edge of death. On the other hand, she wants to catch up with Arisu and be his support, this allows her to out-jump her chasing citizen across the big gap. Her arm is injured during the crash landing which she uses triangular bandage to hold it in place. However, Tatta's death is too much for Arisu to handle, Usagi stays with Arisu who has declared abstention to the remaining games and parts Kuina.
In one day, Arisu spots the rainbow and is motivated to reach the end of the arc with Usagi, they instead arrive at the previous arena of the Seven of Spades and enjoy the hot spring there. Initially bathing separately, Usagi allows Arisu to get closer. They begin having sexual intercourse in the hot spring and continue in their camp.
While Arisu is wandering outside and have not returned for sometime, Usagi is worried and looks for him. Only finds that he is avoiding a gunfight with Niragi and Chishiya. The psychotic Niragi, who has failed to rape her for 3 times, blames Usagi for influencing Arisu so the latter cannot be the same as him. Niragi shoots Usagi, but the already wounded Chishiya pushes her aside and take the shot instead. Usagi is so impressed because she and Arisu have been betrayed by him during the card burglary in the Beach. She quickly uses her triangular bandage to bind wounds of Chishiya, but his true injuries are the crushed organs which cannot be handled in the Borderland.
After witnessing the crash of the King of Spades's blimp, declaration of Isao Shīrabi's defeat, Usagi encourages Arisu to participate the last game in the vague hope of letting Chishiya and Niragi return to the original world for proper treatment. They head towards the Queen of Hearts' arena and meet their former allies before the entrance.