Bekkan 3-kai Danshi Toilet no Nikubenki

At the boys' school attended by the main character, there is a rumor spreading that girls will have sex with them in the toilets on the third floor of the annex.

The main character's friends laugh at him, saying that the annex is just a hangout for delinquents, but he goes there to find out the truth. The
main character is full of hope, but just as his friends said, the annex has become a hangout for delinquents, and he is found by the delinquents.
The main character is told to hand over his wallet, and the delinquents then say something unexpected...