I'm looking for a Yakuza bl manga but I only remember extra

The manga about a young boy typical left with a debt by the Yakuza. The different is he actually fight back and hated them.

I don't remember the rest but the extra is about a perspective of a bookstore owner and the boy was a regular there, the store owner was aware of the boy and question what happening lately to him lately until the boy show up with a envelope large amount of money.

This of course shock the owner, and I don't know the rest but Yakuza head show up and scolded the boy because he didn't hide the money well after they're leave. The owner was still in shock what just happened