At Umenomori Private Academy, Takumi Tsuzuki's routine is disrupted by the antics of his pampered classmate Chise and his childhood friend Fumino, who disguises her true feelings. His after-school job at a cake shop run by his adoptive sister Otome adds another layer to his daily life. But when Otome leaves to assist someone in need, Fumino steps in to make sure Takumi isn't late for school, inadvertently revealing her striped panties. The return of Otome with a cat-like girl named Nozomi shakes up Takumi's world, leading him on a quest to uncover her secrets and the reasons behind her escape.