Kaede Azusagawa, younger sister of Sakuta Azusagawa, endured severe online bullying in middle school that fractured her psyche, unleashing a manifestation of Adolescence Syndrome. This condition inflicted physical injuries—cuts and bruises—paired with dissociative amnesia, erasing her past and splintering her identity into two personas: the original, introverted “Kaede-san,” and a new, fragile identity called “Kaede.” The latter adopted third-person speech, clung to panda-themed attire, and retreated from social contact, paralyzed by fear of outsiders.

Though cheerful at home, the new Kaede recoiled from strangers, panicking during encounters with Mai Sakurajima and others. Guided by Sakuta, she pursued incremental goals—answering calls, stepping outside, attending school—each effort exacting a physical toll. Stress sparked fevers and bruises, remnants of her syndrome’s grip. Support from Mai, Rio Futaba, and Shoko Makinohara slowly fortified her resolve, allowing cautious ventures to public spaces like beaches and zoos.

A reunion with childhood friend Kotomi Kano fractured Kaede’s mental barriers, reviving shards of buried memories. This triggered the rapid resurgence of her original personality, which fully reclaimed her consciousness, erasing all traces of the two-year identity shift. The restored Kaede-san, quieter and reserved, retained no recollection of her alternate self but preserved her close bond with Sakuta. She later enrolled in a correspondence high school and embraced a part-time job at a family restaurant, steps marking her cautious return to societal rhythms.

Physical and behavioral contrasts delineated her dual identities: the original Kaede’s left-handedness versus her counterpart’s right-handedness, the latter’s panda motifs and third-person speech absent in the former. Her story weaves trauma, resilience, and familial bonds, with fractured selves serving as both psychological refuge and a lens into identity’s fragility and reconstruction.