A story about fighting and learning about the life and death of a cat demon.

In the fantasy world, the favorite profession of everyone is becoming a brave adventurer and hunting monsters. They go on quests to hunt monsters until the environment becomes endangered and the monsters are on the verge of extinction. That's why the Monster Keeper unit was established to protect and fight against the brave adventurers.

The love story of a blind street singer and a hot-blooded boy.