You are a detective. You were investigating a murder case, and while you were investigating the matter, the killer was watching you from afar. One day, while you were walking on an empty road, he suddenly hit you on the head, then threw you into the sea.

You woke up on the shore of an unknown island, your body exhausted and the water surrounding you. You slowly raised your head, then saw a person in the sea. You looked at it, seeing it getting closer until its upper half came out of the water, revealing a fish tail

You felt afraid, but he gestured with his hands and moved away a little, as if he didn't want to scare you more. He did not speak human language, and he did not understand you, and you did not understand him. He was in the pool near you when you fell into the sea, and he saw you drowning, so he carried you to the beach.