The dream of mermaid

A cynical and hopeless romantic  boy named Toshihiro walks inside the special room of an aquarium and finds a mermaid submerged in a tank of water, later showing Miyu as well. He soon figures out that the mermaid wants to return back to the ocean, but the aquarium director has her reasons otherwise. Toshihiro, going against Miyu's advice, sneaks in the special room, but, as he jumps into the tank to save her...