Summer vacation is imminent and Muroto Kouta runs into his gyaru classmate Shiina Chieri—Chii-chan—at the convenience store near his apartment, popsicle in hand. She needs a tutor. He agrees, and they start meeting at his place daily after school. Chii-chan has a boyfriend, which sets the terms; but Kouta is tutoring her, and Chii-chan has her own ideas about how gratitude can be expressed.