Chiyuri Kurashima, a 13-year-old student at Umesato Junior High School, shares a deep childhood bond with Haruyuki Arita and Takumu Mayuzumi. Her appearance features pale pink eyes and brown hair typically secured with a cat-shaped pin. She wears the standard school uniform—a white dress shirt, light blue blazer, and green bow-tie—and often carries a yellow duffle bag. Chiyuri cares intensely for Haruyuki and Takumu, though her quick temper can manifest as pushiness or intimidation when provoked. She relishes cooking and eating, frequently promoting healthy diets, and demonstrates forgiveness by reconciling with both boys after conflicts, often requiring appeasement like treats. Unspoken romantic feelings for Haruyuki persist alongside her past relationship with Takumu, initiated at Haruyuki's suggestion to preserve their trio's closeness in middle school.

Discovering Brain Burst through Haruyuki and Takumu, Chiyuri demanded installation to prove the Accelerated World could strengthen rather than fracture their friendship. Despite low-compatibility warnings, she became a Burst Linker. Her duel avatar, Lime Bell, mirrors her traits with cat-like ears, paw-gloves, paw-shoes, and a tail. The avatar dons a lime-green hat with a leaf, a yellow cape, and light armor, replacing its left arm with a massive bell-shaped Enhanced Armament. Lime Bell resists environmental damage and wields "Citron Call," a time-reversal ability mistaken for healing. Mode I reverses damage and resets gauges; Mode II reverses events like item thefts. This power later earned her the moniker "Watch Witch."

During the Dusk Robber arc, Dusk Taker (Seiji Noumi) blackmailed Chiyuri using footage of Haruyuki’s accidental shower intrusion. She publicly allied with Noumi, healing him with Citron Call to rapidly reach Level 4—masking her true goal to unlock Mode II and reverse his theft of Silver Crow’s wings. In a decisive duel, she betrayed Dusk Taker, restoring Haruyuki’s wings to secure his victory. This scheme, orchestrated with Kuroyukihime, led to Chiyuri’s induction into Nega Nebulus, driven by her yearning to reclaim their childhood bond.

In *Accel World: Infinite Burst*, Chiyuri fought with Nega Nebulus against Great Wall until a catastrophic storm disconnected all Burst Linkers and disabled Brain Burst in reality. The film reinforced her legion involvement without new development. Her broader story includes reconciling with Takumu and Haruyuki after their confession of installing a Neurolinker backdoor program, forgiving them post-brief estrangement. She remains an active Nega Nebulus member, supporting allies and deploying her unique abilities in battles.