Oni Futatsu

Oni Futatsu (鬼ふたつ) is a manga written and illustrated by Fujimatsu Mei.

Plot
In a world where people and Shinkis (Inner demons) normally coexist, A highschool student named Kei, who’s currently living with his aunt, is someone who hates Shinkis and he has been hiding his shinki inside him throughout his life. However, he was caught up in a big trouble that caused his Shinki to get out!