A brief description of the manga Doron Dororon:
Humans are under threat from mysterious monsters called mononoke. Dora Sasaki is unbeatable in a fight, and in order to keep a promise to his deceased mother, he aspires to be an anti-mononoke samurai.
However, everything changes when he meets a kind-hearted mononoke named Kusanagi. Welcome to this dark fantasy story of humans and monsters!