Kouta is an unattractive university student who’s living on his own due to complications with his family. Due to his timid personality and poor social skills, he chooses to stay home and absorb himself in studying on his free time.
However, on a hot day during the summer break, he had a fateful run-in with Chieri, a fellow student from his university. Chieri, who goes by Chii-chan among her friends, is an outgoing social butterfly and the center of attention wherever she goes, but studying turns out to be not one of her strong suits. Having just failed her exams and facing the threat of expulsion, Chii-chan immediately seized the opportunity and enlisted Kouta as her tutor.