When average student Mitsuki Mutou is suddenly whisked away to another realm, he is hailed for his rumored extraordinary abilities, only to be rejected for lacking a Special Concept. Despondent, he meets Menou, a priestess who reveals that Mitsuki, as a Lost One from Japan, must possess a Special Concept. Menou, belonging to a church aiding forsaken Lost Ones, offers Mitsuki shelter to unravel his potential. As they delve deeper, they unearth Mitsuki's latent, potent, yet perilous Special Concept. However, amidst this discovery, questions arise about Menou's intentions—does she truly aim to aid the Lost Ones, or is there a darker agenda at play?