Sayama Ai was the one Yukio helped on the street because he lost his phone, from then on they became friends and invited each other to his house to play, after many times they felt closer and loved each other, although he was married, but his family was not very happy, so they became friends and confided in each other, then one day they complained about each other more than friendship, both realized that this was love, waiting for the time when his wife was on a business trip, he brought his lover home and had sex.