Defense Devil

Defense Devil (ディフェンスデビル Difensu Debiru?, Romanized as DEFENSE DEVIL in Japan) is a Japanese manga written by Youn In-Wan and illustrated by Yang Kyung-il. It is serialized by Shogakukan in Shōnen Sunday since April 22, 2009. The story is about a banished demon named Kucabara who decides to become a Defense Devil in order to gather up dark matter which he needs to regain his devil powers again.