Zatch Bell!

After Naomi tells to Zatch that she and her friends are going to a new playground, he wants to go to a "fun place". The funny place is then revealed to be the Botanical Garden, but he and Suzy keep playing with the plants; while Kiyo only feels bored for the trip. They meet a biologist named Ivy Kinoyama, who was a old "friend" of Kiyo. She quickly befriends of Zatch, and Suzy gets lost. Meanwhile, a mamodo duo named Sugino and Haru attacks the other visitors to practice their attacks with "moving targets". Zatch and Kiyo then fight the duo, and at the same time attempts to free the visitors who were caught for their Juron spell. Once Haru discovers their trick to free the people, they use their strongest spell, Raja Jugaro. However, thanks to Ivy and Zatch, Kiyo uses Rashield and reflect their attack, causing the burn of their book. (Source: Zatch Bell Wiki)