Monster Soul

Monster Soul (モンスターソウル, Monsutā Souru) is a manga series written and illustrated by Hiro Mashima. It was serialized in Comic Bonbon.

Plot
The tale of Monster Soul takes place in Elfenland, which is inhabited by both humans and monsters. The main characters are a group of monsters called the Black Airs. The Black Airs is recorded as the strongest group of the monster forces in the great war between the humans and monsters.