Mr. Tachibana, a new part-time worker, looks young, but he is 10 years older than me and is married. - We went out drinking with the girlfriend who seemed to be fighting with her husband, and we hit it off, and without either of us inviting her, we ended up having cheating sex. - Even after the alcohol wore off and we both came to our senses, we couldn't control our sexual desire once it was ignited, and we had sex over and over again. - It's not enough to have sex at home, so they secretly touch each other's bodies in the store's bathroom or backyard. - It seems that my part-time colleague Rin is starting to notice our relationship, but she still can't break free of her affair with Tachibana-san...