Kaere Kimura is a female transfer student who joins Nozomu Itoshiki’s class upon returning to Japan. Struggling with dissociative identity disorder, she shifts between two sharply contrasting personas: her primary alter ego, Kaede, maintains a composed, introverted demeanor, while her aggressive counterpart surfaces unpredictably, marked by hostile outbursts and confrontational threats, including litigation against peers or brazenly revealing undergarments.

Her past includes an unspecified period living overseas, with reintegration into Japanese society coinciding with the escalation of her psychological fractures. Though no explicit catalyst for her condition is noted, her interactions fluctuate between combative posturing and unsettling public displays, underscoring the destabilizing clash of her dual identities.

Documented records contain no elaboration on her experiences abroad, extended character arcs, or appearances in supplementary adaptations beyond the core narrative framework.