On board the armored collection truck, Touko meets fellow reluctant travelers. Meanwhile, in the capital, the orphaned Koushi gets an unexpected offer from a wealthy magnate. Despite his misgivings, this patron could be his ailing sister's only hope.

While Koushi meets his new family and learns about the task before him, Touko struggles to keep her place on the truck. But even if she succeeds, an unexpected obstacle may cut her journey short.

While Touko and her companions flee the wreckage of their trucks, Koushi digs through the archive for forgotten tomes. What he discovers casts his mission in a new light.