In what year was the album “Superman - Single” released by Crystal Kay?

In what year was the album “Superman - Single” released by Crystal Kay?: The album “Superman - Single” was released in 2011 by Crystal Kay, featuring 3 tracks.
What is the most successful song from the album “Superman - Single” by Crystal Kay?: “Superman -Piano ver.” is the biggest hit from the album “Superman - Single” by Crystal Kay.

Other artists of Japanese music