Spiral: The Bonds of Reason

Ayumu Narumi's life takes a drastic turn when his older brother Kiyotaka, a renowned detective and skilled pianist, suddenly goes missing. The only clue left behind is a mysterious and cryptic reference to the "Blade Children." Two years later, a string of murders and unexplained incidents begins to unfold, all seemingly linked to the enigmatic Blade Children. Joining forces with a determined school journalist, Hiyono Yuizaki, Narumi embarks on a perilous journey to unravel the truth behind the Blade Children and uncover the secrets surrounding his brother's disappearance.