Skeletons in the closet.

Osamu dazai knows he isn't the most stable person, he knows he's peculiar. Not quite human, He doesn't feel it. He knows he's far from being sane and normal, but what can he do other than think he's fucking batshit crazy when one night after gazing off into the dark corners of his room, he found a pair of eyes staring back. Yeah, he should really go to sleep.

(alternatively; no one told dazai that no longer human would come with extra abilities, one of which allows him to see ghosts?)