夫のモラハラと義務のようなSEXから逃れるため、深夜のコンビニでスキマバイトを始めた人妻れい。レジのミスを助けてくれた派遣大学生トミフミに「貸し借りなし」の条件としてキスを求められ、ぽっかり空いたれいのスキマが埋まり始める。レジ下、バックヤード、停電で客のいない店内。「キスだけなら不倫じゃない」そう言い聞かせていたはずのれいだったが、キスをするたびに忘れていた「女」の感情が目覚め始め…。

Rei, a married woman, takes a part-time job at a convenience store late at night to escape her husband's emotional abuse and obligatory sex. When Tomifumi, a temporary college student, helps her out with a mistake at the register, he asks for a kiss as a condition for "breaking up," and the void in Rei's life begins to fill. Under the register, in the back room, in the empty store during a power outage. Rei had been telling herself, "It's just kissing, it's not adultery," but with each kiss, the forgotten feelings of "woman" begin to awaken…