Happy Days (Otsuka Ai)

Happy Days is the fourth single by Otsuka Ai.

CD

 * 1) Happy Days
 * 2) Hoshikuzu (星くず)
 * 3) Happy Days (Instrumental)
 * 4) Hoshikuzu (星くず) (Instrumental)

DVD

 * 1) Happy Days (Music Clip)