Five years ago, on that day, I crossed the line of infidelity. When my husband's affair was discovered, he cheered me up with his clumsy words, which happened to be from his son's friend, Kagura-kun. Despite knowing it was wrong, I found myself giving in to his genuine feelings and succumbing to his desires more and more each time we were intimate. As our relationship progressed, I became aware that my initial intentions of using him as a means to get back at my husband had evolved into real feelings for Kagura-kun.

5年前のあの日に、私は不貞の一線を越えました。夫の不倫が発覚し、意気消沈する私に拙い言葉で好意を伝えてくれたのは息子の友人・結弦くんでした。彼の真っ直ぐな気持ちに流された私は、許されないことだと分かっていながらも、年下の男の子に何度も求められ身体を重ねる毎に、罪悪感が薄らいでいくのを自覚していました。夫への当てつけの気持ちで始めた関係の筈が、日に日に彼への気持ちが募っていってしまって…。