When Shimamoto falls to the dead, survival becomes instinct.

For everyone else, the military is hope.
For Arata Kurogane, it is a threat.

Once known only as Subject Thirteen, Arata was raised in a secret military program that turned orphaned children into weapons through pain, experimentation, and relentless training. They were never people.
They were weapons.

He escaped.
The military never stopped looking.

Now, as the world collapses and the dead roam the streets, Arata is forced to protect classmates who are slowly realizing he isn’t just skilled—he was made for this. With the infected closing in and the military hunting him as lost cargo, Arata faces a single question:

Can someone built as a weapon choose to be human?