 Tomokawa (Okuda) is a tough guy turned bored cop who spends much of his time sating lonely housewives and looking after retarded teen Sukemasa. One day while hanging out at a bar, he is approached by a 15-year-old enjo kosai named Yoko, offering a round of illicit sex in exchange for cash. Though he demurs, their paths cross again and soon a relationship of sorts forms. Yoko, it turns out, is Sukemasa s sister; and both are the children of his old flame Yukie (Marie Natsuki), a grasping, self-centered woman. Moreover, Yoko s grandfather is responsible for the massive tattoo sprawling across Tomokawa s back. Tomokawa soon takes both teens under his wing, protecting them from their heartless mother, and their lecherous stepfather. Soon, Yoko gets a similarly massive tattoo illustrating her bond with her policeman savior.