During her adult college years, Akari had a boyfriend whose sexual chemistry with her was so perfect that she could think of nothing else. Afraid the obsession would ruin her life, she forced herself to leave him. Years later, she is engaged to another man, yet memories of her ex remain deeply carved into her mind. When a class-reunion invitation arrives, she plans to decline for fear of seeing him, but her fiancé replies for her and accepts. At the reunion, a mere touch from her ex revives every memory of their sex-crazed past. Swept away by desire, she agrees to visit a hotel “just once,” then forgets the fiancé waiting at home and loses herself in the man who still knows every sensitive spot on her body.