Spiral: The Bonds of Reasoning Vol 2

From the Yen Press edition

Ayumu Narumi aggressively pursues his goal to unravel the mystery of the "Blade Children." With every step he takes, though, the path to the truth becomes more treacherous as a conspiracy is revealed. Could it be that Ayumu's fate was intertwined with that of the Blade Children even before his journey began?

Source: Yen Press