Shueisha released one drama CD Sket Dance ドラマCD (ISBN 978-4-08-901169-0) on October 30, 2009,[REF][REF] and a second Sket Dance 2 ドラマCD (ISBN 978-4-08-901171-3) was released on April 28, 2010 [REF].
SKET DANCE extra dance1: Theory true?