息子の友人である北山くんと、人目を忍ぶ不貞の関係に溺れてから、気づけば5年もの歳月が流れていました。あの頃、夫の浮気が発覚して心も身体もボロボロだった私に、ただ一人優しく寄り添い、孤独を埋めてくれたのが彼でした。「浮気の仕返しがしたいんですよね。僕じゃダメですか？」そう言って真剣な眼差しで迫る彼に、罪悪感を覚えながらも突き動かされるように一線を越えた夜。それ以来、夫と息子の目を盗み、私たちは何度も密会を重ねてきました。しかし、北山くんに新しい彼女ができたという報せを境に、5年間守り続けてきた歪で愛おしい関係は、静かに狂い始めて―。

Five years had passed since I became entangled in a secret affair with Kitayama-kun, my son's friend. Back then, my heart and body were shattered after discovering my husband's infidelity, and he was the only one who gently comforted me and filled the void of my loneliness. "You want to get revenge for the cheating, don't you? Am I not good enough?" He said, his eyes serious, and I crossed the line that night, driven by a sense of guilt. Since then, we have met secretly many times, stealing moments away from my husband and son. However, after hearing that Kitayama-kun had a new girlfriend, the twisted yet precious relationship we had protected for five years began to quietly unravel.