Students are not wealthy people, and they need money. So Asumi finds a part-time job as an au pair. Naruse's family is small: single father Keiichi and his son Ichika. Asumi, who has never questioned his orientation, realizes from the moment he meets his charming father that perhaps when choosing a future partner, he should widen the scope and consider representatives of not only the opposite sex. The situation escalates when Asumi accidentally catches Keiichi watching an adult video. Asumi's stamina gives out, and he is no longer able to resist his desires!