This is kinda good , i like manga about hellish suffering . It just other people's suffering is the best lullaby ever , it make my quality sleep better and revitalize me .
And this manga , not only provide laugh , it have tons of trio mc's suffering which is always good . Laughing decreases my stress and bad cholesterol , and sufferings make my sleep even better . So in conclusion : following this manga makes my health better .
EDIT : after reading this manga in one go i realize that
imho the boss is absolutely brilliant , no he's not demonic or devilish at all , just being true to himself