Ayumu Narumi has lived all his life in the shadow of his famous detective brother, Kiyotaka. However, Kiyotaka disappeared two years ago, leaving behind his wife Madoka and Ayumu himself, along with a cryptic message about the "Blade Children." One day, a girl at Ayumu's school suddenly dies. What seemed like a suicide at first glance turns out to be a murder, and Ayumu is the prime suspect. While investigating the person responsible for framing him, he discovers that the mysterious Blade Children are involved—and they somehow know Kiyotaka personally. Ayumu soon finds out just how dangerous the Blade Children are and learns that, in reality, he and Kiyotaka are intertwined more closely than he had ever believed. Narumi Ayumu lives in the shadow of his older brother's disappearance two years earlier. Now residing with his brother's wife, police detective Narumi Madoka, Ayumu is constantly preoccupied by the last words his brother spoke: Blade Children. As a series of mysteries arise, Ayumu uses his formidable detective skills to solve the crimes. But it is always the larger mysteries that continue to loom over him. Who are the Blade Children? Why did his brother disappear?