- Spiral

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Plot: Two years ago, Ayumu Narumi’s older brother Kiyotaka, a famous detective and pianist, disappears without a trace. Ayumu’s only clue as to his brother’s whereabouts is the phrase “Blade Children,” the only words Ayumu could make out in Kiyotaka’s final phone call. Now in high school, Ayumu becomes involved in solving in a series of murders and other incidents, all related to the Blade Children. Together with his school’s journalist, Hiyono Yuizaki, and the unwilling assistance of his sister-in-law, Madoka, Ayumu tries to figure out who the Blade Children are and what are their goals.