Saiyuki: Vol. 8: Soldiers of Destiny

The War is Fought From Within.

Everyone's got their reasons for giving Sanzo and his ragtag group trouble, rather than serve in heaven, Souto and his crack team of God-soldiers enlist in Homura's army. Then, two young siblings modified by Gyokumen Koushu through black magic try to nab the Maten Scripture in exchange for their freedom.

But when the same second-rate imposters foolishly try to pose as the legendary travelers, they learn again the hard way it's safer to be yourself. That's why Gojyo, Hakkai, Goku and Sanzo always persevere: they fight no one's battles but their own!