This is Manju Town, which is tucked into a back alley. In the town, someone has opened doors to other worlds everywhere, and there is constant conflict between people from other worlds and humans. In order to deal with such situations, there is a different world management bureau known as Ikaika that protects the citizens! Kaichi Date, a hot-blooded boy, gets a job at Ikaika in order to find his twin brother Kiichi, who was spirited away when he was a child...!? A strange world with an ordinary but extraordinary worker. An intertwined daily fantasy!