Vanilla is very shy, timid and cute. She cries a lot (which attracts boys) and is very kind and gentle. She is the opposite of Chocolat and has a very soft voice. Vanilla is also more conscientious. She doesn't get angry a lot (rarely) and her familiar is Blanca, the mouse (who gives good advice on how to win hearts, unlike Duke) and Vanilla is very babyish. She loves cute stuff and she is a good cook. She is smart as well. Vanilla is a very sweet girl and she is the daughter of Queen Candy. She is more popular in the human world and Vanilla also tries harder than Chocolat in becoming Queen. 

Chocolat Meilleure and Vanilla Mieux are two witches who are pitched in a contest to see who will become the new Queen of the Witch World. They must travel to the Human World and collect the hearts of humans. Whoever collects the most "human hearts" wins. Even though they're rivals, the two are still best friends. Join them on this adventure!

Little witch-girls Chocolat and Vanilla are best friends, but only one of them can be Queen of the Magic World. To determine who deserves the title, they must go to the Human World and enter a strange competition. Whoever attracts the most human boys... wins! 
Here's how it works: When a boy falls for a witch-girl, she utters a few mystic words and the boy's heart will be hers in jewel-like form. It may sound simple, but winning hearts is tricky business. While Chocolat had no problem enticing witch-boys with her forthright personality, human boys seem to be drawn to shy and modest girls like Vanilla. And to make matters worse, Chocolat is finding herself increasingly drawn to the cool and mysterious Pierre-who feels nothing for her! The girls had planned to be best friends forever, but both of them want to be Queen. Will their rivalry ruin their friendship? (Source: Del Rey) 
Note: Won the Kodansha Manga Award for Children's Manga in 2005.