Tired of waiting for too long to see what's out of the sea, the mischievous Princess Purple escapes without her father's supervision to discover the land, but things gets complicated.

Purple finally joins to a human school and is excited to introduce herself nicely and meet new friends! But suddenly, she discovers that she is not the only princess that joined her same school.

Purple wants to be a perfect princess like Red, so she decides to use a mysterious necklace that her father kept it on his room.

Purple's identity is in danger of being discovered since Leo's pet pig: Kaka, who secretly brought him to class, accidentally stole her headband that keeps her disguise.