Tatsuo, a college student living alone in Tokyo, is enjoying his new student life and has recently fallen in love with his first girlfriend. However, as the days pass, he begins to feel homesick. Being away from home for the first time, he starts to truly appreciate his mother's warmth and kindness. One day, his girlfriend asks to see old photos, giving him a reason to return home for a visit. When Tatsuo comes back with his girlfriend, he finds himself unexpectedly captivated by his mother, Ryoko Asamiya, whose feminine charm and beauty stir emotions he's never felt before. Her allure overwhelms him completely—so profound and intense that it borders on obsession.