The story takes place in a world where people continue their war against the "unknown"—the enemy of humanity. Children who have been evacuated to a cold sleep facility during the invasion by the "unknown" several decades ago wake up from their slumbe

The story takes place in a world where people continue their war against the "unknown"—the enemy of humanity. Children who have been evacuated to a cold sleep facility during the invasion by the "unknown" several decades ago wake up from their slumbe