Info.

Bakugou Katsuki is a siren, Sirens have the ability to mimic the sound or voice of other creatures and gender so they can lure humans into the water no matter what.

Kirishima Eijirou is a professional diver and helps with animal rehabilitation. He started working there at 16 and was now top diver at the center.

They are 18 or older in this story. And they don't know each other. Also Bakugou isn't always rude, he is actually nice. Except with the humans and sometimes the mermaids depending on who they are.