[Crossover + Titanic] Dear Mr. Merman

He sang in the sea. For hundreds of years, he watched countless ships shatter to pieces at the sound of his song, from small wooden boats to sailing ships, from sailing ships to steamships. Weak humans kept advancing, while the powerful sea demons could only go on singing at sea. Sea demons had almost endless lives, keen minds, bewitchingly beautiful faces, and great strength. Yet even with all that, they could only hunt and kill like beasts, relying on their fangs and claws.

Because the gods had never granted him a soul.