Alisa, a mother who has taken over her husband's stepchild, Takashi, and has lived quietly since she lost her beloved husband. One day, he receives a proposal from Sato, who was acquainted and dating at work. It was a thankful story for Alisa, who had a hard time living, and she was thinking positively, but Takashi constantly insists that "I like mom and two." After that, the relationship between Alisa and Sato deepened further, and they often indulged in affair. However, Takashi's eyes are from the gap. Takashi burns a flame of jealousy when he sees Alisa's plump bust and Sato sucking on her hips. And the abnormal desire for the body of "mother" was also awakened ...