While I was on a business trip, my return flight was cancelled and I was at a loss as to what to do, when suddenly, a beautiful flight attendant called out to me, and it turned out to be Tsumugi, a plain wife from the neighborhood... It was the first time we had a proper conversation, but I hit it off with her because she was friendly and a good talker, and we ended up having a relationship while drunk. I should have stopped after this, but as I continued to do slightly abnormal things that I couldn't do with my wife, only on business trips, we got deeper and deeper into each other...