Koinoborigami

This is a belt-shaped sheet of paper, which has some parts of two fish.

The problem is to fold the sheet to make all of them against the sky without clouds.

This puzzle has another title Skyfish? for the people who do not speak Japanese.

Moreover, the same principle is used in Shut Up, and Quiet Horn in Paper Puzzle Pack series.

In 2016, another version was made, which is different in color.