A 19-year-old man attending a national university in Aichi Prefecture spends his days immersed in theater rehearsals and a warring-states-style simulation game. He has had only one sexual experience in his life, with a woman 13 years his senior. Lacking knowledge at the time, he simply followed her lead. Her only romantic relationship was with a married man, which ended after six months. Since then, she has become shy and withdrawn, never finding another boyfriend. However, she can't forget the pleasure she once experienced, and those memories remain vivid. One day, after she guided him through a tourist spot with a hidden mobile camera installed, he invited her to a hotel where she swayed her hips provocatively, reaching climax repeatedly—an act that had become part of her secret routine.