Alex is a very shy and introverted princess. She loves reading and is very tired of the boring life in the palace. By chance, in the palace garden, Alex saw a mysterious door flashing. She had seen the same door in a story before. What Alex didn't expect was that behind the door was a fantasy world full of magic and magical creatures. Here, Alex met a group of kind friends - the lively, cheerful and optimistic mermaid Romy, and the smart and calm Nori. They told Alex that there was a very willful and violent ruler Marlucia in this kingdom, and the magic they used was taken away by Marlucia. In order to help her friends take back what originally belonged to them, Alex embarked on a journey.