Monster Soul (stylized in all caps) is a Japanese manga series written and illustrated by Hiro Mashima.

It was serialized in Comic BomBom from January 2006 to August 2007 and collected into two tankōbon volumes.

In the "second stage" the Black Airs travel to Hell to help a human boy save his townspeople who are captured by the evil Drei Kommandos.

[4] Rebecca Silverman of Anime News Network praised the artwork and concept of the story, though she also felt it was generic and lacked plot.

[8] Danica Davidson of Otaku USA praised the flow and characters, though she also described their jokes as "crude".