Rebuild World (Manga)

Akira is uneducated, underfed, and unprotected—just another homeless kid in the sprawling slums between the walls of Kugamayama City and the deadly wastelands which surround it. Relic hunting offers his only hope of clawing his way to a better life outside the slums. But his first, desperate foray into the ruins threatens to end his brief life—until he meets a mysterious, incorporeal woman named Alpha.