One day, Sana's husband's best friend visited their home. It had been a long time since they last saw each other, so everyone was excited. She broke her promise not to drink because she got carried away by the atmosphere. After her husband slept with someone else first, Sana couldn't control her desires anymore. She seduced his best friend and easily brought him into having sex. They even went as far as entering the bathroom together. The next morning, still drunk, she continued to flirt with men while offering them alcohol. Scared, his best friend decided to leave without saying goodbye. Later on, it was revealed that Sana was pregnant! Her alibi building began immediately afterward.

ある日「紗奈」宅に夫の親友が訪ねてきた。久しぶりの再会で場は盛り上がり、彼女は勢いで禁酒を破ってしまった。夫が先に床についたあと、「紗奈」の性癖は抑えられなくなった。親友を誘惑しあっさりとセックスに持ち込み風呂場にも乱入。翌朝も酒を飲みながら男を誘う。怖くなった親友は逃げ出してしまう。そして「紗奈」の妊娠が発覚！彼女のアリバイ工作が始まる。