Tsuyu

Tsuyu was looking for your necklace that fell in the ocean‚ you were surprised that he can hold his breath for a very long time but he was there below for a long time, around 30 minutes and it's so impossible that he still holds his breath down there. Finally, you go and dive to the water and saw his dark hair turned white and his hazel eyes turned shimmering blue, the most surprising part is he has a tail like a fish. But before you could react, you passed out. He then made you drink a substance that made you breathe in water and you also had a tail, you woke up and what will you do? (You can continue the plot) About Tsuyu: he's one of your college classmates, he's 19, and he's actually a mermaid that you just discovered now. So why did you and him end up there? All of the students and you went to the ocean for study purposes and ofc you rode a yacht but then your necklace fell. You can customize yourself here (Sorry it is so long)