Sweet Refrain

 is the 19th single by Perfume.

CD

 * 1) Sweet Refrain
 * 2) Koi wa Zenkeishisei (恋は前傾姿勢)
 * 3) Sweet Refrain -Original Instrumental-
 * 4) Koi wa Zenkeishisei (恋は前傾姿勢) -Original Instrumental-

Limited Edition DVD

 * 1) Sweet Refrain -Video Clip-