In the distant past, the seas of Runeterrae gave birth to civilizations long before the land. Deep in what is now known as the Sea of Watchers, there was once a magnificent city – and where the Yodeler Fiz settled. He lived with the craftsmen and warriors of this proud and noble race. Although Fitz was not of the same kind as them, they treated him without any prejudice. Add to that his quirky temperament and amazing adventures in the vast expanse of the sea, and any party with him will be filled with joy.

But the world has changed, and the oceans have become warmer, attracting ferocious predators in the deepest trenches. Settlements everywhere have lost contact, but the city's rulers are still arguing over how to deal with the danger. Fitz volunteered to find the survivors, or whoever knew the details.

It was a complete accident that woke him up. A large fish made of wood swam on the surface of the sea, and a handful of copper coins were scattered on the seabed near the trail. Of course, it wasn't a dragon shark, but Fitz was alert that he didn't know much about the world above, but surely no fish could live on the surface, right? He ventured upstream, poked his head out for the first time, and smelled the salty sea breeze.

Someone. They live beyond the ocean, riding large and small wooden fish back and forth on the water. Fitz was scared and excited, but they threw magical gifts into the water, indicating that they must want to be friends with him. So, Fitz followed their voyage in time to make it all the way to the port city of Bilgewater.

In the mouths of the inhabitants of that outlawless land, this strange and slippery creature soon became a legend - the Tidal Sea Spirit, a spirit from the sea. He is said to be able to summon huge monsters for his own use, to make holes in the hull of ships with his seastone trident, and to breathe on land as well as in the sea. Many disobedient children hear the warning when the moon is dark and the wind is high: "Go to sleep, or the sea spirit will catch you and feed the fish......"

Then one day, the dragon shark came.

These massive monsters stun their prey with a shrill whistling, and the streets of the majestic city soon become filled with red clouds. In just a few hours, thousands of people died. The dragon shark hunted excitedly and went on a rampage in a frenzy, destroying the towers and temples of the city. Fitz smells the blood in the water and rushes back, wanting to join the fight and protect the city.

In the deep ocean of the Runeterra, the light of the moonstone guards the peace of the mermaids.

Through an ancient ritual, the Sharks would select a warrior to dive deeper into the abyss to retrieve an Abyssal Pearl, and then exchange it for a new Moonstone with the Landwalker.

But their chosen tide caller did not return.

There is a wayward girl named Nami in the merman tribe, and she decides to dive into the deep darkness herself, before the light of the moonstone is completely dim......

Nami is a powerful young Vastaya Sea Clan. When the ancient contract between the Shark and the Titan was broken, she was the first to leave the sea and set foot on land. She had no choice but to step up to the task of fulfilling the sacred rites to ensure the safety of her people. In the midst of the chaos of this new era, Nami faces the unknown tomorrow with great determination and fearless fighting spirit, summoning the power of the ocean with the staff of the Tide Caller in her hand.

Nami, a powerful young Vastaya Sea Clan, can use her magical Staff of the Tide Caller to change the shape of the tide and protect her people from danger. She was the first of her tribe to leave the sea and set foot on land. Faced with an unimaginable unknown situation in front of her, she gritted her teeth and forged ahead with great determination and fearless fighting spirit.

In the sea to the west of the Giant God Peak, there is a tribe of Vasaya called the Shark Clan. A long time ago, these creatures discovered a crack in the abyss of the sea. In this bottomless chasm, there is a terrifying, spreading darkness that wants to wipe out all living things.

In the center of the merman village, the merman placed a moonstone that emitted light. Legend has it that this moonstone has the magic of the stars infused by heaven, and its holy light can repel the darkness of the depths and keep the mermaids safe. Every 100 years or so, the moonstone begins to fade. At that time, the tribesmen would select the strongest warrior and give him the name of the Tide Caller.

To earn the title of Tide Caller, you must dive into the bitter cold abyss, overcome terrible obstacles, and bring back a pearl of the deep. If successful, the Tidecaller will go to the shore on behalf of the Shark Clan and trade with the Radiant Wanderer from the top of the Titan Peak, exchanging pearls for moonstones. It's a daunting process for the Tidecaller, who carries the fate of all his people and does his best to keep the creatures of the darkness at bay. In the past, the Sharks sent elite troops to the Abyss to collect pearls, but they found that the more men they sent, the more difficult the dark creatures became, as if they would adjust their strength to the strength of their opponents. Strangely, when the army is wiped out, it is possible for the Tide Caller, alone with the legendary wand, to avoid the danger of the abyss and return with the pearl.

Nami's ambition has always been to become a tide caller, she is a tough warrior, but she is too young and reckless. She is notoriously stubborn among her clan, and has had a lot of hardships as a result. When she came of age, the moonstone darkened for the first time in a hundred years. She took part in the selection of the Tide Caller. But because of her impulsive nature, in the end, the elders chose a warrior named Rasha, who was cautious and calm in war, and was their ideal tide caller.

After Rasha dived into the abyss, he was not heard from for a whole month. There has never been an example in history of a Tide Caller failing.

While waiting, the moonstone's light was about to fade, and the elders quarreled. Nami knew that someone had to step up and take on the task of being the Tide Caller, otherwise, everyone would perish at the same time.

This person may be her.

Nami picks up her mother's Abyssal wand and dives into the abyss. A few days later, she returned, and although she found the pearl and the fallen Tidecaller's wand, there was a faint fear in her eyes. Despite being unhappy with Nami's audacity, the elders admired her courage and officially appointed her as the Tide Caller. She ascended to the surface and rode the tide to the shore to meet the Radiant Wanderers.

However, there were no wanderers on the shore. There was only one old woman standing on the beach waiting.

The old woman said that her grandparents had witnessed the last time the tide caller traded. She came to tell the merman that there was no moonstone this time. The only Moon Star Spirit who can conjure a moonstone with magic has escaped from the Giant God Peak.

Nami couldn't believe the news. In order to save the lives of her clansmen, she decided to find the moon star spirit and retrieve the moon stone.

Through the magical power of manipulating the tides, she condensed a pool of water that never dried up under the tail of a fish, and set foot on land for the first time to continue her mission.

With the determination to become a benevolent person if it doesn't succeed, the tide caller swims into the unknown world.

No one believed what the girl said. Even when people wrapped her in a blanket and comforted her to calm down and express her meaning in full sentences, her words were still out of tune.

These villagers live at the foot of the Giant God Peak, and inevitably come into contact with a lot of strange things. But the boy's words were completely unbelievable.