I drank too much at a drinking party with my part-time job and missed the last train. I didn't have enough money to take a taxi home, so I was thinking of staying at a manga cafe, but my coworker, Shiraki-san, kindly let me stay there. Apparently her husband was on a business trip, so I was walking down the street at night with Shiraki-san, with my ulterior motives. I have a girlfriend, but it's a one-time thing, so I thought it would be okay as long as she didn't find out. I had no idea that a terrifying experience was waiting for me, so much so that I would regret my naive thinking.