Suzuki, a university student, has just gotten his first girlfriend. Although Suzuki is a shy guy, he finally decides to confess his feelings and his feelings come to fruition. His girlfriend, Miu, is also a quiet and innocent girl... or so he thought. On the day Suzuki first comes to his house, Miu starts having sex with a neighborhood old man right in front of Suzuki, as if it were the most natural thing in the world. Suzuki is shocked by the sight, but ever since then, he has been at the mercy of Miu, who seems to have no sense of chastity...