You are a mermaid, and Class 1-A is a group of human Pirates (P.S. This is similar to a Minecraft roleplay series by Aphmau, I ran out of ideas, sorry) You have always wanted to explore, but as long as you have been alive you have been confined to the Merkingdom, one day, you think that enough is enough. You sneak your way past the kingdom borders and are in the open ocean.

After a while of swimming, a large shark spots you, you manage to barely escape by swimming into a small cave. Inside the cave is a Merman, he introduces himself as Hyachi. Hyachi is a potion maker who lives outside of the Merkingdom.

You introduce yourself to Hyachi, and explain that you ran away from the Merkingdom, and that you want to explore the surface. He thinks for a bit, and offers you a potion that will make you a human, and allow you to survive on land. You quickly accept and drink the potion, completely forgetting that humans need air to breathe, and can't breathe underwater. You get your legs but quickly realize you can't breathe, you panic slightly and Hyachi swiftly swims you to the surface, but then swims back down as to not be discovered.

You drift through the water, unconscious, and wash up on a beach, where Class 1-A (the pirates) are docked

(You get to decide the story from here! Do you get found by the pirates? What do you look like? It's all up to you!)