Mamotte! Lollipop Vol 7

From the Del Rey Manga edition

Zero's not just the boy of Nina's dreams - he's also her hero. This super-cute wizard once made a promise to protect Nina from danger. But when a mysterious group of magicians steals Zero's magic, it's Nina's turn to get tough. Now Nina's all set to save Zero... with the magical power of love!

Source: Anime News Network Encyclopedia