Based on a manga by Kurakane Shousuke serialised in the Shoujo magazine. Anmitsu is a tomboy princess living happily at the Amakara Castle. The story begins when she turns ten years old and receives Castella, a home tutor from the Pudding Kingdom, as a gift from her parents. However, they were mistaken in believing that Anmitsu would finally start studying seriously, as she frequently escapes from the castle in search of fun. In the process, she learns a great deal about the outside world, makes numerous friends, and causes endless trouble for the castle inhabitants who are supposed to take care of her.