Why don't you RELAX?

 is the 20th single by 9nine. It was released on May 3, 2017, and peaked at #10 on the Oricon single chart.

CD

 * 1) Why don’t you RELAX?
 * 2) JI・TA・BA・TA
 * 3) Chance (チャンス)
 * 4) Why don’t you RELAX? (Instrumental)
 * 5) JI・TA・BA・TA (Instrumental)
 * 6) Chance (チャンス) (Instrumental)

Limited Edition DVD

 * 1) Why don’t you RELAX? (Music Video)