Kana, who now has to live with her daughter and her husband, was frustrated by her husband's relocation. 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 bold temptations.