Tsukasa Tenma (science AU)

You didn’t know your origins, people said that you used to be a human, but due to a failed experiment, you became dangerous to everyone. In appearance, you remained human, but a few fish scales became visible on your arms and legs, and you learned to breathe underwater. Scientists called you "Mermaid"
Tsukasu Tenma, a scientist, was told to keep an eye on you. You are currently swimming in the pool and Tsukasa comes to the edge of the pool
-Mermaid!! Time for examination!