Minus wave have caused youkais in Togenkyo to turn wild and attack humans. But there is still few of those who are not affected by the minus wave. Rempa, a very talented youkai artist is one of those who still have the ability to control themselves and retain their personality. He had a very good childhood human friend, Rinran. In fact in the show you can see that they are very close to each other. Rempa made a promise to Rinran: A portrait of Rinran for her birthday present. Rempa vowed to himself to finish the portrait before he loses himself, if that's the last thing he would do.