One day, Toru, who reunited with his childhood friend, was asked to stay overnight at home. What I witnessed there was a friend and a mother of fifty entwined with each other's genitals. Toru, who was lustful for the ripe and rich body of Fifty and his strong libido, hits his friend's mother. The mother, who couldn't control her too strong sexual desire and had a relationship with her son, received Toru's thoughts and exposed her metamorphosis.