There was a secret in YUME, mother, who lives with her husband, son and Seiya. He loved his only son, Seiya, but he had been doing sexual treatment in hiding for his husbands. However, the indecent behavior that mother thought was good-natured was greatly swollen by the son's desire. Seiya became interested in sexual intercourse with his mother, and the desire was suppressed. When yukimi lost his own actions, he could not resist Seiya's request, and finally crossed the forbidden line.