Gyokairui Yamaoka Maiko

Gyokairui Yamaoka Maiko ? is a 2011 Japanese fantasy film. The film was directed by Rytar Kajino, and it stars idols Uki Satake and Cocoro Takami.

One day, while picking up seashells along the beach, Kamoka spots a girl sprouting out of the water. The girl introduces herself as Maiko. And although this girl is dressed in a high school uniform and looks like a human, she is a type of fish. In the end, Kamoka takes Maiko back to her home.Over time, the friendship between Kamoka and Maiko deepens. The pair was invited for dinner at Mochiros home. At first, Kamoka had the wrong impression that Mochiro had romantic feelings towards Maiko. She later finds out that Mochiro was actually scheming to cook Maiko into fine cuisine dish. At the same time, Maiko starts to have a sudden transformation. ........

Source: Wikipedia