This isn't an alien love story although aliens and love are at its core.
This isn't a story about lost innocence although that certainly happens.
This isn't a post-apocalyptic story although that's exactly where and when it occurs.
This is the story of a young man born into a small clan that lives in a cave and hunts with stone tipped spears. His simple life revolves around providing for his clan and loving his family. It's all he knows, all anyone has known for generations. Then disaster strikes and he's forced into an epic journey where he experiences unimaginable hardship and unexpected kindness as his eyes are opened to just how big his world really is.