Spiral: The Bonds of Reasoning Vol 13

From the Yen Press edition

Hizumi's "happy high schooler" facade begins to crumble as Ayumu confronts Kirie about Hizumi's cheerful acceptance of the fate that awaits him. Big brother Kiyotaka has always cast a shadow over Ayumu's life, but what kind of despair has Hizumi known that would make him so ready to die? Hizumi still hasn't laid all of his cards on the table, and his next play could take out one of the Blade Children for good.

Source: Yen Press