Sakura Banka originated as the removed memories of Kikka, formed after Kikka became King. Existing solely as a soul without a physical body, she awoke devoid of any identity or origin memories. Ichinose later revealed her nature and connection to Kikka.

She wears a bright orange scarf, a school-like shirt and skirt, and a yellow diamond hair clip. Her personality shifts mysteriously between focused determination during serious matters and a lighthearted, playful mood with friends. She exhibits analytical tendencies and manipulative behavior to achieve her objectives.

Unable to safely participate in Rebuild Battles due to the risk of death upon defeat, Sakura sought a worthy champion for her wish. During her search, Teruto Kurabe saved her from an attack by another player. Sakura challenged him to test his capabilities. After his victory, she entrusted him with her wish, believing him capable.

Her purpose was intrinsically tied to Kikka's desire to see Teruto again. Sent by Kikka to locate and guide Teruto back, Sakura knew her existence as an independent entity was destined to end through reintegration. Aware of this inevitable fate and influenced by Ishinome, she deliberately accelerated the process. She stole Teruto's accumulated tokens required to challenge the King and used them to initiate a battle against Kikka herself. This sacrifice, undertaken knowing she could not win, ensured her fusion back into Kikka occurred before Teruto could reach the King.

Her story arc concludes with this sacrificial battle and subsequent fusion.