In a bustling downtown area where crimes involving gay dating apps are on the rise, Police Officer Mitsuki Shiraishi, who wants to make a name for himself, decides to go on an undercover mission by pretending to be a masochistic gay man.

The man who appears at the meeting place is Kakeru Kujo, known as【K】. A suspicious looking man with a mask and a hat. Shiraishi is quickly taken to a hotel by Kujo. To avoid being found out and making Kujo wary, he reluctantly goes along with Kujo's "play." However, with every torment, his body reacts sensitively, and his hidden masochistic talent blossoms unexpectedly…!