After her husband died, Natsuko, the mother, co-runs the restaurant he left behind with a man named Shigemoto. Her only son, Tomohiro, does not approve of the relationship between Shigemoto and his mother. "One Itsuka, he's going to take it all for himself!" In order to continue protecting the restaurant his father left behind, he desperately needs a child to take over. However, Tomohiro's wife is ill and cannot give birth to a child... Driven into a corner, Tomohiro rapes his beloved mother...