Spiral: The Bonds of Reasoning Vol 15

From the Yen Press edition

Hizumi makes his final plea, begging Ayumu to accept the fate that has been forced upon them. By killing Hizumi and taking out Kiyotaka before his own natural demise, Ayumu can remove all the supernatural pieces on the board. After all he's been through, Ayumu certainly intends to meet his brother, but will he face Kiyotaka in the name of defiant hope - or broken surrender? That may depend on Kiyotaka, as he reveals his last cruel twist of the plot in the final volume of Spiral.

Source: Yen Press