Yokubô dômei

Veteran detective Ishiyama and novice detective Kawanishi are in charge of a case in which a young man was raped and then murdered in a hotel. Kawanishi begins investigating Otori and comes into contact with several men. Is the culprit a martial arts enthusiast, an SM enthusiast, or someone unexpected? During the investigation, the following incident occurs. Kawanishi becomes lustful every time he meets men and begins to realize that he is gay. What did Kawanishi see the next morning, intoxicated with dazzling pleasure?