The 15 year named "Nocturne, Naito" has a dream. It's to become a NEET. A NEET that has already gained money enough to live his life as a NEET without relying on everyone. A NEET where he can enjoy his life lazing around reading books(Light Novel/Manga in a Fantasy World) using the money he has earned. He will use the only way he knows to gain money achieve this dream. The way he gained money to be able to help feed the kids in the orphanage he grew up in, Hunting monsters.
Becoming an adventurer is the easiest way to NEETness.