tatchan's manga / #Prison(4)

Didn't read in detail, basically a dude is the last of a group of yakuza and has to be protected. His seme has a dragon tattoo which helps him remember his past. He gets raped quite a few times. Seme dies in the end because of a ghost of an asshole who he used to have an assistant, he almost also dies but no. The assistant started all the drama and the war dk the yakuzas... all because he wanted the seme for himself.