Living in the shadow of his renowned detective brother, Ayumu Narumi's world is turned upside down when Kiyotaka vanishes, leaving behind a cryptic mention of the enigmatic 'Blade Children.' As Ayumu grapples with suspicion in a classmate's demise, initially labeled a suicide, he unearths a sinister murder plot targeting him. Delving deeper into the mystery, Ayumu unravels a connection between the Blade Children and his missing brother, leading him to a chilling realization of their intertwined fates and the lurking dangers ahead.