Chocolat (voiced by Marika Matsumoto) and Vanilla (voiced by Juri Inobata) are two lively and lovely little witches living in the demon world. One of them will become the next queen of the demon world, and for this, a fierce competition has begun between the two. The two girls came to the human world, and their task is to collect crystals condensed from human emotions. The more they have, the more they can win the competition and get the title of queen. Chocolat has a cheerful and enthusiastic personality, and she regards dealing with humans as a piece of cake. Who knows that the human world and the demon world are very different, but the shy Vanilla is more popular. One day, Chocolat met a boy named Pierre (voiced by Daiki Konishi), and Chocolat, who never knew what true love was, fell in love, which meant that she was about to lose her witch heart. Not only that, the evil Oger people attempted to rule the human and demon worlds, and they first targeted Chocolat and Vanilla.