Based on the Danish fairy tale, The Little Mermaid by Hans Christian Andersen, The Little Mermaid tell story of a pretty mermaid princess who wants to become human to be with handsome human prince.
Akako a seventeen-year-old mermaid princess, is dissatisfied with life under the sea and curious about the human world. She lives in an underwater kingdom with her father (the sea king or mer-king), her mother, grandmother and her six sisters. Her six sisters are each born one year apart.
When a merperson turns 18, she or he gain the ability to turn into human and when they become wet, they turn back into a merperson. They are also is permitted to swim to the surface to watch the world above, and when the sisters become old enough, each of them visits the upper world every week.
With her best turtle friend Aki, Akako collects human artifacts and hide them in a grotto. As each of them returns, Akako listens longingly to their various descriptions of the surface and of human beings. The youngest of seven daughters of the rulers longs to witness the surface world but only when she is 18 will she be allowed to make the journeys.
Soon Akako birthday arrive and she turn eighteen.
She rescues a young Prince name Rei from a sinking ship during a storm.
She becomes so besotted with him that she makes a terrible deal with the Sea sorcerer to be transformed into a human girl but at the cost of her voice.
Akiko drinks the potion, loses her voice, and goes to the surface. Prince Rei takes a liking to Akiko, as he feels he should show her the same kindness that the person who had saved him from the wreck showed him. Over time, Rei falls in love with Akijo and wants to marry her but soon
as Aki, Akako sea turtle best friend.
as Chiyeko, one of Akako older sisters.