The director of the anime disliked the story in the original manga. He asked permission to make changes to the story. Because of this the mangaka, Mohiro Kotoh, told his fans not to watch the anime.
Based on a Japanese manga series written and illustrated by Mohiro Kitoh. It was serialized in Shogakukan's seinen manga magazine Monthly Ikki from November 2003 to June 2009, with its chapters collected in 11 tankobon volumes.