It was the spring of 5th year of Reiwa, a time when kimonos and sandals were still widely worn. In Fukamachi, the flower district of Kosaka, a certain incident was threatening people's lives. One is a very vicious and terrifying incident called a passerby, and the other is a haunting act that is persistently performed night after night. In what we now call stalking, men and prostitutes who go to geisha districts are especially targeted. Together with the incident of a random passer-by, the insidious crime became an object of fear, and gradually people started to move away from the entertainment district.

Through his best friend "Kurozaki", the main character is offered a job as a chaperone for a high-class prostitute, Tayu "Yotsuru". The main character had never worked as an escort before, but he immediately agreed because he thought he could repay the temple for its kindness. However, when it comes time for the nightly escort, this tayu comes closer and closer to the protagonist, who is the watchman! First with her mouth, then with her tits, and finally she pushed it as far as she could go...!? He would get up in the afternoon to gather information from the people of the city to find the culprit, and at night he would sleep with tayu till morning, The main character is immersed in the sex life in the flower district, which is a little bit seedy...