Pi-chan, Fuuta’s younger sister, relocates to his home after transferring schools and begins navigating life with Kyuruga, the household cat. Early interactions are fraught with tension—Kyuruga resists her overtures, even biting her—but her patient efforts slowly earn the cat’s trust. Progress emerges through small gestures: Kyuruga starts seeking meals from her, lingering near her, and eventually curling up in her bed during Fuuta’s absence, signaling a tentative bond.

She actively manages caregiving duties, scheduling vet appointments and adapting the home for Kyuruga’s comfort. Her history intertwines with the cat’s presence, as she originally brought Kyuruga into Fuuta’s life. Initially portrayed as the sole authority on feline care, her role later evolves as Fuuta grows more involved, balancing responsibilities between them. The narrative traces their dynamic’s shift from cautious friction to quiet coexistence, anchored by her steady, pragmatic efforts to bridge the gap between household and pet.