Plot: A demon of fire from the depths of the earth and a demon of ice, living on the moon (look - space is cold - OKAY), are fighting a battle for the right of dominion over the planet earth (which would also result in the destruction of life on earth). The planet is used like a giant chessboard and when "Pieces" come close together they battle to the death (their battle pawns are born into human vessels). So what happens when two warriors, En of the Fire Master and Shimo of the Ice Lord, are reincarnated into the same body (especially when Anthea has no clue she's being used in this way)? And what is the purpose of Nana, the bat-like creature that accompanies both into battle?
Anthea (Blossom) the "Vessel":

Anthea had has a reletively ordinary life (except for a few odd incidents) so far but as the "Pieces" are coming into contact, her life will be thrown into chaos...
En (Blaze) the "Knight":

En wields a sword of pure flames in battle and has attacks that can strike her opponents at multiple angles.
Shimo (Frost) the "Bishop":

Shimo's weapon is a staff of pure ice. Although her attacks only strike at one angle, they can be highly devistating.