Meet the Iwatobi Swim Team. Even though it had just been formed, founded by three childhood friends, it defiantly has a promising future for the members. Meet Y/N L/N, your ordinary every day mermaid. Well that took an unexpected turn, in fact, one night when Y/N finds a key necklace an unexpected storm occurs, causing her to end up on an island, where she later finds herself waking up to the Iwatobi Swim Club and new Human legs.