Elemental Ou

The Guild Master and the Protectors of the Elements had the best intentions. All they wanted was to use the Grand Card in order to summon the Grand Master who would protect the world, just like the legends said. Surely they could not predict would would happen. That the Grand Master would be a sexy, but decidedly unfriendly girl. That she would quickly realize that she wields the power over all Elves. That she would kill all the Protectors. And that she would swear to destroy humanity...

Only one person can stop the Grand Master. A simple young human boy named Nemo, but with mysterious ties to the race of Elves. When his father is killed by the Grand Master's minions, he knows that it's not just about saving humanity - it gets personal!...

[From MobyGames]