Her shy son brings his friend Endo home for the first time. Yuri welcomes Endo, who is known for being good at both academics and sports and being kind, but Endo has a hidden side that is unknown to her. His kindness is only on the surface. Endo, who has never cared about friendship, has his sights set on Yuri's body. He wants to cuckold that magnificent busty body. Tragedy strikes the defenseless Yuri, who is unaware of Endo's filthy desires...