Knights of the Zodiac

Seiya, a very stubborn boy, is an orphan who lives on the street trying to scrape together money through underground fighting. In fact, the young man is not the only survivor of the family: as a matter of fact, he is desperately looking for his sister, who has been kidnapped. During one of his fights, Seiya manages to access to a source of mystic powers, of which he was unaware. The boy finds himself thrown in a world unknown to him, where he undergoes a magical training to fulfil a mission. In fact, his task is to protect a war goddess.