Disclaimer: I don't own Free: Iwatobi Swim Club

Water.

One of the four elements.

A giver and taker of life.

It is something that no living creature can survive without, whether they live in it or above it.

It is something that covers the two thirds of the earth, known as the sea, divided up into areas called oceans.

Water is many things to many people, both good and bad.

To those who dwell on land, water is a way to survive. Beings on land use it to stay hydrated, bathe, travel, for agriculture, leisure, catching food, and various other things.

To those who dwell in the water, it is everything. It determines how they live and survive.

On the surface, humans see the sea as a large blanket of water covering the earth where fish live. However, there is so much more than that. Deep beneath the sea lie beings of myth and legend that remain hidden from the surface.

A civilisation thought to be long lost, otherwise known as Atlantis, flourishes. It's people far superior to that of humankind. They are stronger, faster, resilient and more powerful than humanity, for they possess the gift of magic bestowed upon them by the sea gods. Their society is divided up into different classes based on power and abilities. These classes are sea serpent, undine, siren and nymph.

Sea Serpents are the warrior class. These are individuals who are trained in hand to hand as well as armed combat from the day they can walk. They know basic Atlantean magic and possess the ability to shapeshift into an aquatic animal that matches their spirit to increase their fighting prowess. Physically speaking, they are the strongest type of Atlanteans.

Undines are practitioners and masters of magic. They are skilled in all forms of magic but still retain some melee combat ability. It is their magic that keeps Atlantis as well as others like them hidden from those on the surface. It is also their magic that makes them feared among the oceans.

Sirens are singers and musicians of Atlantis. The know basic magic but are not skilled fighters. Their voices are melodic and enchanting with the ability increase the power of individuals (be it strength, speed, defence, or magic), as well as control certain individuals. They are especially effective when controlling a human (surface-dweller).

Nymphs are the lower class of Atlantis. They can only use water as an ability and thus act as farmers to keep the sea pure and uncontaminated. Despite being an important job acknowledged by the king himself, Nymphs are often looked down on and mistreated due to being weak.

Ruling over these classes was the Royal Family, the Matsuoka's. The head of the Royal Family was King Toraichi, a wise, strict, fierce (when in battle and dealing with political matters) yet benevolent ruler. His wife Miyako had passed away two years ago. Due to this he was left to raise his two children, his son Rin, his first born and heir to his throne, and his daughter Gou, all by himself. The Matsuoka's, due to being descended from the first Atlanteans had powers related to all classes though they mostly chose to study under one.

Atlanteans aside, other species lived in the sea. These were enemy species to Atlantis. They included Kraken, Piranha, and Cecaelia. They served under the control of the Sea Titan Leviathon, who's power rivalled that of the Sea Gods. He constantly waged war with Atlantis in an effort to control the seas and later destroy the surface.

That aside, one might be wondering, what about Merpeople. Do they exist? They did exist at one point. They were a race that were part fish and human. They were one of the first Atlantean species and had access to powerful magic because they retained their connection to land. They were wiped out millennia ago.

When they were destroyed, there was no trace of them left behind. Only legends and fairy tales. That is until this night!

Hi there. Well, what did you think of that? this is an idea I thought of recently and I just couldn't get it out of my head. As the title suggests, it involves elements from the tv series H2O and Mako Mermaids and most of the magic seen will be from it (most of it). The show being one my inspiration for it, I was also inspired by Undine by Tenkku which is where I got the idea to use Undines as magic casters. Also, despite the amount of information given, and Rin being mentioned, Rei is the protagonist. Hope you like this! Please review!