Sogovision (Firm)

Haruka Ozawa's sophomore year is getting seriously scary. One of her friends is possessed, another has committed suicide and Haruka could be the next one to flunk the still-breathing test. So, what's her only way out of this potentially lethal dead end? Yakumo Saito, an enigmatic student born with a mysterious red eye that allows him to see and communicate with the dead.

Average high school student Yuri Shibuya is dunked in a toilet by some local bullies when he takes a stand against them, and finds himself transported into another world populated by warring humans and demons, where he is crowned king of the demons.