In a world just like our own, a new breed of humans with extraordinary abilities started being born. These creatures were labeled as demons and considered far too dangerous they were banished to the underground. 17-year-old Kaen Takao faces a dire challenge. When his brother vanishes without a trace, Kaen is forced to journey to the surface for answers. As he explores the unfamiliar world above, he uncovers a sinister conspiracy that threatens both the underground and the surface. Haunted by secrets and facing dangerous foes, Kaen must confront his deepest fears. Will he find his brother and unravel the truth, or will he become entangled in a plot that could alter their worlds forever?