After failing the university entrance exam twice, Shinichi is still a ronin student struggling to make progress in his studies and growing increasingly anxious. Seeing his situation, his family calls in Yumi, a highly skilled private tutor. Expecting a middle-aged woman over fifty, Shinichi is startled when Yumi appears—her beauty immediately catches him off guard, captivating his gaze and stirring excitement within him. But Yumi's personal lessons soon take a turn, evolving into something far more intimate than mere academics.