One day, single man Kizuna meets a housewife named Tsumugi while she's stuck in traffic nearby. He helps her when her bike breaks down by fixing it, which leads them to become friends. As their relationship deepens, they start spending more intimate time together at his place while her husband is away at work. They find solace in each other during these moments, sharing passionate encounters that help ease the loneliness of their secret affair...

一人暮らしの結弦はある日、近所で立ち往生する人妻・つむぎと出会う。自転車が壊れて途方に暮れる彼女を助けた結弦は、それをきっかけに彼女と仲良くなって…。関係を重ねるうちに2人の関係は深まっていくのだった。結弦はつむぎに合鍵を渡し、つむぎも夫が出勤すると買い物袋を片手に結弦の家へと向かうようになった。そして夫婦すれ違いの寂しさを紛らわすように、結弦の部屋で濃密な時間を過ごすようになり…。