After losing her husband, the mother and son live together. The son loved Kurenai, who loved him wholeheartedly, more than his own mother. When the son gets a job, the two of them have to live apart, so they go on a trip to a hot spring to make a final memory. The son steals the kiss from his mother, whom he loved as a woman. With her heart in turmoil... she knows it's wrong, but the mother is torn between the bond between parent and child and the pleasure of sex. Caressed gently, her private parts overflow with lustful juices. The mother takes her son's penis into her mouth and invites it into her vagina. This is a forbidden incestuous journey of desire and incest, as they make love again and again.