Monster Soul In Elfenland, where monsters are a constant target of bounty hunters, live Aki, Touran, James and Mamii, a group of extremely powerful humanoid monsters known collectively as “Black Airs”. Despite their desire to live in peace, with hefty prices on their heads and immense strength, Black Airs is a prime target for money-hungry humans and jealous monsters alike. With the likes of rebellion groups attempting to scout them and three-headed beasts seeking revenge, will Black Airs ever be able to live quietly in a world where humans and monsters coexist in harmony?