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息子の担任保育士のひかりはこどもから人気だった。そんなひかりと父親は妻子が帰省中、不倫関係に陥ってしまう。定期的に自宅で会うようになり、気づけばSEXに明け暮れる日々。嫁と息子が帰ってくる前日ひかりは驚きの行動に出る…。