Spiral, Vol. 4: The Bonds of Reasoning (Spiral)

The showdown between Ayumu Narumi and the Blade Children duo of Rio and Asazuki enters stage two when Hiyono is kidnapped and an intricate challenge involving perfectly- timed bombs and blackmail is set before our unlikely hero. Ayumu must deal with the ultimate question: can he measure up to his genius brother Kiyotaka after all?