The Wall has fallen. Physics is broken. Follow two worlds in a violent collision.

Odd Chapters: The Fantasy Epic of Grain. Even Chapters: The Sci-Fi Thriller of Zone Rose.

For a millennium, humanity was split. The West: A tech-optimized dystopia of cold logic. The East: A primal land of elemental spirits and mana. Now, the barrier is gone.

Zone Rose is a hollow genius, a "depreciating asset" born into a hyper-logical dynasty. When his mission across the threshold ends in disaster, he is left a prisoner in a world where technology is a pathogen and his mind is his only weapon.

Grain is a tribal survivor whose world was scorched by "metal demons" from the sky. Driven by grief and an early-awakened Black Steel Bear spirit, he is swept into a brutal Imperial conscription.

One seeks to dismantle magic with logic; the other seeks to endure iron with spirit. Which half will you choose?