Becoming a Saint Seiya since the Age of Mythology

When he opened his eyes again, he found himself out of modern society and into a mythical era, a world belonging to Saint Seiya.
Strangely, he discovered that his memory was missing; he had forgotten everything that belonged to him, including his name.
However, he remembered everything about the Saint Seiya.
He resolved to join the Sanctuary, to find his past, and to explore the root of all this.
But when he actually got involved, he was horrified to find that more and more unknown enemies were appearing, making this holy war increasingly complicated and difficult.
"Is this really the same 'Saint Seiya: The Lost Canvas' that I know?" he questioned.