I've been looking for a video I watched months ago. I couldn't find it in my watchlist. It was about a boy being seduced by a mermaid/siren. A monk/druid looking guy catches wind of this and gives him a slap on the back of his head to bring him back to his senses. The boy doesn't listen and spends more time with her which in turn leads to her drowning him. The video ends with a catastrophic tsunami hitting the beach and killing the monk/druid too. Its art style looked old and similar to pic related.