An earlier work from the author of the popular manga series Fairy Tail.

A group of monsters known as Black Airs come across of pair humans who are looking to make some money hunting monsters with bounties on their heads. The Black Airs make quick work of the bounty hunters who fail to learn their lesson as they become overly ambitious and attempt to hunt the Black Airs. This proves to be a terrible mistake and we get to see just what makes the Black Airs so special- enormous power and even stronger friendship.

Series Overview- In the Monster Soul world, a war was waged between humans and monsters, with the monsters falling on the losing end of a treaty. The peace between the monsters and humans is tenuous and monsters are frequently persecuted by humans. As a result, monsters tend to stay away from humans and keep a low profile. One group of monsters, known as the Black Airs, lives boldy with a purpose- to have fun and take care of each other. They get in to all kinds of trouble with reckless abandon, but as long as they stick together, they'll be all right...probably.