his origins differ slightly between the oav and anime. in the anime, gau is ten when the attack occurs. seeing his parents murdered in front of him, gau snaps and attacks the bandits. he kills most of them, but then his luck runs out. elle shows up before he himself is killed, and finishes off the remaining bandits. in the oav, bandits attacked his home village when he was nine years old, slaughtering everyone, including gau's parents. over the next year, gau exercised guerrilla-style attacks against the bandits for revenge. he eventually encounters elle on the road by chance.