Yuzuki attends middle school alongside her identical twin brother Kazuki and close friend Ruko. After noticing Ruko eating alone in the cafeteria with a WIXOSS card, she strikes up a conversation with her new acquaintance. Despite being impulsive in combat situations, Yuzuki's actions often lead to errors due to this trait.
In the last episode, Yuzuki is freed from her card and becomes human again.
After seeing what happened to Hitoe she desperately wants to win her battles to avoid her wish taking a turn on her like it did on Hitoe.After challenging several Selectors, she wins her final battle and becomes the Eternal Girl.
She has feelings for Kazuki Kurebayashi, her twin brother, and to make such relationship possible, she battles in hopes of winning his affections.