After her husband's death, mother Natsuko runs the family restaurant in partnership with a man named Shigemoto. Her only son, Tomohiro, deeply resents Shigemoto, believing in his heart, "That guy intends to take everything for himself someday." To preserve the restaurant left behind by his father, an heir was necessary. However, Tomohiro's wife was unable to bear children due to illness. Cornered and desperate, Tomohiro forcibly rapes his beloved mother...