Story
Private detective Ousuke found an unexpected guest on his doorstep one day: his old friend Yaichi, now an ex-yakuza with a strange new power... and a mission for revenge. He was looking for the man who killed his beloved mentor, and Ousuke agreed to help him. He never was able to resist rescuing the guy. Even worse, almost as if he knows Ousuke is pining for him, Yaichi crawls into his bed whenever he has nightmares of his mentor's death, tormenting Ousuke without even realizing it.
Synopsis via AniList (English).
