夫婦共働きの亮平とミサ。在宅勤務で自宅に籠りがちな亮平は気晴らしに外に出る際、時折マンションのエレベーターで一緒になる美しい女性の事が気になっていた。彼女の名は一花。同じマンションに住み、ミサと同じヨガ教室に通う人妻だ。ある日、自宅の鍵を失くした一花が途方に暮れているところを見かけたミサは、ご主人が帰るまでウチにどうぞと声をかけ…

Ryohei and Misa are a working couple. Ryohei, who often stays home due to working remotely, occasionally goes out for a change of scenery. He notices a beautiful woman he sees in the apartment building's elevator. Her name is Ichika. She lives in the same building and attends the same yoga class as Misa. One day, Misa sees Ichika looking lost and distressed after losing her keys to her apartment. She offers her a place to stay until her husband returns…