Kaiba

A young boy with no recollection of his past awakens with a mysterious marking on his belly and a hole through his chest. His only clue to his identity is a locket containing a picture of a girl he doesn't know. As he navigates this strange new world, he meets Popo, a character with a clear purpose. Popo reveals that in this world, some people are memories without bodies, while others are bodies without memories. The wealthy harvest the best bodies, leaving only the poor and forgotten to struggle below. Despite his lack of memories, the boy becomes a target for those seeking to claim his life.