Spiral: Suiri no Kizuna
Spiral: Bonds of Reasoning
スパイラル~推理の絆~
Two years ago the brilliant detective Narumi Kiyotaka disappeared, leaving behind his wife and younger brother with only a mysterious message about the "Blade Children". After being falsely accused of murder, Kiyotaka's younger brother, Ayumu, finds himself drawn into investigating the cursed Blade Children and their connection with Kiyotaka.
(Source: Inane)