Rei lost her mother at a young age and grew up in a father-daughter household. However, her father is often away on business trips, so she spends most of her days living alone. Rei was a quiet and top-performing female student but had a habit of fantasizing about being pinned down by older men and indulged in self-pleasure. One day, a neighbor named Masakazu brought around a noticeboard and assaulted her while she was asleep, having sex with her. This became the catalyst for Masakazu's brother, Ippei, and Ippei's friend, the middle-aged delinquent Hideto, to set their sights on her as well…
