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, Leona, is also a quiet and innocent girl... or so he thought. On the day Suzuki first comes to his house, Reona Leona 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 is at the mercy of Reona, who is so lewd that she Leona to have no sense of chastity...