The one in the front is named Aaron. He's a 12-year-old boy adopted by some High schoolers and the chick behind him is his adopted sister Grace, about 15 years old. Grace was brutally murdered with the rest of her siblings by a character named Darkness. Aaron had missed her and the others ever since yet realizes he's better off the way he is now. Living a happier life, he's forced to set out to save the only family he has left.