The Fairy Queen is Erza, then who is the Fairy Princess?
Natsu: She is my dear sister, but she is even stronger than me! One day, I must defeat her.
Elsa: She is a good sister. She always brings warmth to my family.
Ragusas: I must become stronger in order to protect her.
Gray: He can also use water magic, which is really powerful.
Makarov: I am really proud to have such a member.
Fairy Tail: She is everyone's good sister, but her strength is really... So strong!
When the fairy princess comes to the world of tutoring, what kind of sparks will arise?