The story takes place in the Indian Ocean, the two young girls are mermaids aged 18 and 15. They are called Siana and Leeya. These two young girls are sisters, their mothers have just left for a few days and they find themselves alone.These two young girls have magical powers transmitted by their mothers.
Siana is the pretty red mermaid who wears a t-shirt matching the colour of her tail, red border. She is rather shy and reserved and prefers to spend time in her room. Leeya, is the pretty blond mermaid who wears a t-shirt matching the colour of her tail, blue. She is very sociable and likes to go out with her friends, even too much to get lost.
One day, she moved too far away from home, but her sister had followed him to reassure herself. She saw her talking with a witch floating in the air, dressed in dark colors. She was accompanied by her creature, a caterpillar of the same color as her. This witch seemed to be planning a coup behind Leeya’s back, naively she followed her into her castle, but Siana still behind tried to remain discreet.
When she arrived at the witch’s castle, she changed her attitude and became evil, she kidnapped little Leeya and took her to her castle guarded by two devils. Siana and the accompanying fairy were very surprised. Siana prepared a plan with her girlfriend, so that she could enter the mansion, to save her sister.
Arriving in the room where the witch kept her sister, Siana ordered her to release her under pain of transforming her castle and all these inhabitants into octopus and putting them at the orders of the mermaids for 1000 years. The witch decided to release Leeya.
When the parents of the two young mermaids returned, they were both happy and laughing. The witch was ancient history that would stay on a secret.