Ai, a high school girl, is molested by the same old man on the train almost every day. Even though she wants to change her morning commute to school, there are few trains in the countryside, so she always has to endure being molested by the same old man on the same train. Then, one day, her mother introduces her to someone she wants to remarry, and to her surprise, it turns out to be that old man... The gentle girl, unable to resist when she thinks of her mother, begins a life of being violently molested not only on the train but also at home.