The Strongest Diabolical Denizen - By Neshowbdo

What is it.. that.you are seeing? ' A distorted faint voice that constantly haunts Aki became a companion.Aki had no idea why. Train station,his mother's dead body and a white transparent being in his nightmare.. As soon the siren sound starts,it makes Aki see something that he doesn't recognise.This Siren wave is something else. A warning? Or a reminder? Reiji,a non-human being falls for him.After these two met,the hidden world falls into mess.The betrayer who can dwell in this two different worlds seamlessly and rule over, a threat to the non-humans,arises.