My college senior invited me over to his place. He seemed happily married to a beautiful wife. As we reminisced late into the night, he offered for me to stay at their home. However, during the night, I accidentally witnessed my senior and his wife engaged in masochistic training. The next day, while he was away at work, I found myself alone with his stunning wife...

大学時代の先輩の自宅に呼ばれることになった。素敵な奥さんと結婚し幸せそうだ。久しぶりの再会で思い出話が盛り上がるうちに夜遅くになってしまい、先輩宅に泊まらせてもらうことになったのだが、夜中に先輩と奥さんのマゾ調教を目撃してしまう。翌日、先輩は仕事で家を出て俺は奥さんと二人っきりになってしまった…。