In a far-flung time when Gods and Men walk the earth together, the child Arion plays in the rolling hills of Thrace. His mother Demeter is troubled by both a curse - blindness - and by the secret of Arion's birth. A mysterious stranger spirits Arion away, and seeks to shape the growing young man into an assassin, a secret weapon to tilt the balance of the war between Zeus and Poseidon. But Arion won't be manipulated easily, nor will he submit quietly to the hands of adversaries like the tenacious Ares, the intelligent and fierce Athena, or the elegant and scheming Apollo. Only his tremendous strength, a forgotten weapon forged by Prometheus, and the love and loyalty of his allies can carry Arion forward. To discover the secret of his destiny, Arion will have to storm Mount Olympus- and face down Zeus himself! (Source: Discotek Media)

Arnaud Arbessier is a French voice actor. 

The young Arion is tricked by Hades and is taken to the underworld where he is trained to become a warrior strong enough to defeat even a god. Thrusted into a war among the Titan brothers, Arion embarks into a colossal saga towards the Olympus, home of Zeus. 
This is the story of Arion, a little boy raised by only his blind mother in a barren land. One day a man comes to visit his mother. This man calls himself Arions uncle and Arions mother calls the man Hades. The uncle convinces Arion that he knows where Arion can get a hold of a special herb that can cure Arions mothers eyes, and so the boy willingly comes with his uncle Hades on a journey. The moment Ariona agrees to go, his mother feels it in her heart and rushes out of her little house and screams at the sky ; Zeus, your brother is taking Arion to the land of the dead. Follow Arion on his adventures among old greek gods and godesses.
 
(Source: Anime News Network)