No Guns Life Vol. 9 (manga)

In the stifling darkness of the Extended detention center known as the Weapons Vault, Juzo and Mary come face-to-face with their own pasts. They went in looking for a way to repair Juzo, but Mary also wants to find out what happened to her brother Victor. Deep inside the vault, they encounter Number Twelve, a GSU that Juzo thought he had destroyed. The forgotten knowledge he possesses may give Juzo the strength and purpose to continue his struggle against Berühren.