It was the Saturday right after exams. Summer vacation was right around the corner. Chii-chan's a girl who lets her titanic tits, plump thighs, and meaty ass shake with every single step. She flashes her panties like second nature and oozes so much sex appeal that she ruins the grades of any guy sitting next to her in class. And now, it's Kouta's job to tutor her at his apartment every day after school.