Hibari Torikai, a high school student whose avian-inspired surname mirrors her bird-like qualities, navigates school life with a delicate demeanor shaped by chronic health struggles. Her sporadic attendance and fragile constitution contrast with a subtle playful streak that emerges in fleeting interactions, where she occasionally nudges classmates with light mischief.

Her longtime bond with class president Sora Sarutobi—marked by monkey-like traits and a prickly sensitivity to simian comparisons—fuels a dynamic of affectionate teasing. Hibari’s bird-themed identity playfully clashes with Sora’s reluctance to embrace his own animal motif, their banter echoing the story’s thematic focus on animal-inspired personas. Within the main narrative, her role centers on these school-bound relationships, her presence weaving fragility and whimsy into the fabric of daily student life.