In the wake of a mysterious portal's emergence linking Earth to a realm teeming with fairies and monsters, San-Teresa grapples with an influx of otherworldly inhabitants. Amidst rising crime within the city, ex-JSDF soldier Kei Matoba, known for his unorthodox methods, joins a special police unit to tackle the growing illicit activities. When a botched fairy trafficking case costs him his longtime partner Rick Fury, Kei embarks on a quest for retribution. Paired with Tilarna Exedilika, a far-from-human noble from the Farbani Kingdom, Kei reluctantly teams up with this Knight of Mirvor to solve the case and return the abducted fairy, all while navigating their contrasting backgrounds and beliefs.