I work at the head office, but I was sent on a one-week business trip to a branch office that was not doing well. I was feeling depressed because I was asked to do some tedious work, but when I headed there, I met my admired senior, Tomoki, who was my trainer when I joined the company... I was confused when I saw her with a ring on her left ring finger, but I couldn't help but feel sad for her, who was still as beautiful as she was back then. That night, I went out for a drink for the first time in a while, but I must have gotten drunk in a bad way, because I fell asleep and found myself alone with my senior in an unfamiliar hotel...