「アイツ、俺の彼女と浮気してますよ」そう告げられた祐樹の妻・小雪。夫の親友・慎二の告発から数日後『二人がラブホで落ち合うらしい』と連絡がある。半信半疑でホテルに向かうとそこには女性に寄りかかりホテルに入っていく祐樹の姿。夫の潔白を信じて調査に協力することにした小雪は、再びホテルへ潜伏すると部屋からはいかがわしい声が聞こえてきて…。パートナーに裏切られたショックで迫る慎二を拒めず、一線を越えてしまった小雪だが、それは、夫の親友が企てた夫婦への罠だった…。

"He's cheating on me with my girlfriend," Yuki's wife, Koyuki, is told. A few days after her husband's best friend, Shinji, makes the accusation, she receives a message that "the two are apparently meeting at a love hotel." Skeptical, she heads to the hotel and finds Yuki leaning on a woman as he enters. Believing in her husband's innocence, Koyuki decides to cooperate with the investigation and lies low in the hotel again, only to hear suggestive sounds coming from the room… Unable to resist Shinji, who is shocked by her partner's betrayal, Koyuki crosses the line, but it turns out to be a trap set for the couple by her husband's best friend…