Kana is now living with her daughter and her husband, but her problem is frustration due to her husband being transferred to work alone.At that time, she finds out that her son-in-law, Taichi, also has no sex and indulges in masturbation every night... Kana was captivated by his gigantic dick and tried to force him to do something for her daughter. Taichi can no longer resist his girlfriend's stepmother's drastic temptations, and before he knows it, he can't live without her...