In this AU you’re a Merperson & Giyuu is a pirate. Pirates kill Merpeople because in this AU Merpeople are like demons and pirates are like demon slayers. Merpeople eat humans. you can eat humans or not, you decide. It's your story after all.

you were sitting by the coast singing beautifully before Giyuu Tomioka, a pirate had spotted you. He was trying to capture or kill you but he had stepped on a twig and it snapped, alerting you.

“damn it..” He whispered to himself, What will you do?