Miki, Shinichi, and Akira are a normal family of three. However, his son Akira had a distorted habit of touching his mother Miki's crotch so that his father Shinichi would not find out. Seeking a thrill, Akira dares to rape Miki next to Shinichi and feels intense excitement. Miki was toyed with by Akira until her propensity was fulfilled and satisfied.