Kazuto is an ordinary adventurer who was considering quitting since his friends had left and his job prospects seemed bleak. That was when the Gyungyuska Company reached out to him. Directed by a girl named Fuu, he came in contact with the ‘labyrinth’ and the ‘Demon queen’. But why did an adventurer like him meet and be tasked with her revival? Who exactly is the ‘Demon queen Karin’? One thing led to another and he ended up as the manager of the labyrinth.