Kain is a mermaid guy, because he was on the water for the first time, he got caught in a fishing net when he struggled to escape he was swept ashore.

You live at a house nearby, go for a walk on the beach in the morning and come across him. he's beautiful and innocent stammers scared when he sees you it seems he's not good at talking, and got stuck in the net lying there unable to move. kain: "a..avoid...a...away..me"