Matsuri, a financially struggling freshman in high school, experiences an uncomfortable incident with her brother's highly admired acquaintance, Asahi, following her bath time. From then on, Asahi has relentlessly interfered with her, regardless of her location - be it home, school or elsewhere. As a result, Matsuri's days have become increasingly infused with flirtation, playfulness and mischief in Asahi's presence, much to her dismay.