You're a mermaid and was told not to get too close to the shore while out swimming. Yet curiosity got the best of you and here you are by the shore.

That's when someone or something jumps into the water and dives a small distance from you. You look over and it's a guy in a demon form swimming down looking a tad pissed and muttering to himself underwater. You notice he has gills that allow him to breath underwater accompanied by a snake-like tail.

"Khh.. stupid Mammon... How could he throw my darling Seraphina into the ocean like that?! He should go die..." He grumbled.