Gin no Mugibatake

The "Golden Wizard" is the hero of a saved kingdom, and the "Silver Wizard" is the cursed being who killed the king. One day, May, a baker's daughter living in a country where the lore of the two wizards remains, finds a piece of wheat shining silver on the outskirts of town. What awaits her is a "silver wheat field" covered in shimmering silver wheat. This is a tale of silver fantasy woven by wizards.

(Source: Square Enix, translated)