Demon Lord 2099, Vol. 3 (light novel)

Demon Lord Veltol-s search for his missing retainers brings him to Yokohama, a metropolis that broke away from the continent and is now a solitary island in the middle of the ocean. This so-called -Meta-Utopia- is full of mystery and intrigue-and it-s home to a massive prison ruled by an entity who has some nefarious schemes. Veltol, meanwhile, has a plan of his own: He-s breaking into jail!