Spiral: Bond of Reasoning

Ayumu Narumi's older brother Kiyotaka, a skilled detective and pianist, vanishes without a word. Two years later, a series of murders and incidents linked to the Blade Children unfolds, prompting Narumi to collaborate with school journalist Hiyono Yuizaki to uncover their connection. Their investigation begins to shed light on Kiyotaka's disappearance and the complex relationships between the Blade Children.