A or B

 is the 39th single by Nakashima Mika.

Single Information

 * Lyrics: jam note (track 1), Ando Yuko (track 2), Kobayashi Takeshi (track 2)
 * Composition: jam note (track 1), Kobayashi Takeshi (track 2)
 * Arrangement: MANABOON (track 1), Kimura Kayoko (track 1), Kobayashi Takeshi (track 2)

CD

 * 1) A or B
 * 2) Happy Life
 * 3) A or B (Instrumental)

Limited Edition DVD

 * 1) A or B (Music Video)
 * 2) A or B (Music Video Making)