Arisa, who lives with her daughter and son-in-law as a family of four, one day learns from her son-in-law Yohei that he has doubts about her daughter. Thinking of the couple's best interests, Arisa starts investigating her daughter's surroundings with him. However, as they spend more time together, Yohei becomes increasingly distracted by Arisa's massive breasts. Gradually, the son-in-law forgets his original purpose and can no longer suppress his desires in front of that obscene pair…
