When was Koi Shiyō created?

There is no known song or piece of media called "Koi Shiyō". "Koi Shiyō" translates to "Let's fall in love" in Japanese.

Please provide more context or information about the specific "Koi Shiyō" you are asking about so I can assist you better. For example, you could specify:

* The artist or band who created it.

* The genre or style of music.

* Any other relevant details.

This will help me locate the information you need.