"answer the call of the wild!"
Mika is the main character in the story. He is a mutant that lives with a " roar "in his brain. He lives in future London behind a wall that is solid concrete and has high voltage wire around it. It is heavily guarded. He has a twin sister named Ellie who went missing and he is searching for her. He feels that she is still alive and see his opportunity when someone is recruiting mutants for a violent virtual gaming competition and starts searching for her