15 years ago, a diate that no one has seen before, appeared over the Pacific ocean Beyond bundle of a cloud-like gate that always changes its fore world A world where fairies and monsters exist The “Leto-Semani” [City of San Teresa, Caliaena island] A city located on a giant island that suddenly appeared together with the gate Built in the northern part of the island, it becaht squire from another world [Kei Matoba], a detective of special force police department They have to chase after the same culprit, in this city of the borderline between science and ic From the same author of FULLMETAL PANIC! and illustrator of LASTEXILE