Himitsu no Akko-chan M

The main character, Atsuko Kagami nicknamed Akko, is a girl who cherishes a mirror that has been passed down from generation to generation. However, the mirror breaks due to an accident. When she is sad about it, the Queen of the Mirror Land appears and gives her a transformation compact device as a thanks for taking good care of the mirror until this time. So Akko takes on the role of escorting a prince who comes incognito to learn about the human world. The compact device, which can also be used as a smartphone, is full of functions needed to protect the prince in addition to transformation. What will happen to Akko and the prince in this adventure?