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Arisa, who lives with her husband and daughter, confesses that one day her son-in-law, Yohei, is distrustful of her daughter. Arisa, who thought for the couple, started a background check on her daughter, but Yohei was distracted by Arisa's huge breasts as she acted together. Gradually, the son-in-law forgets the purpose and can not suppress his desire in front of the obscene huge breasts.