AA

 (Double A) is a collaboration mini album released by Kawasumi Ayako and Shimizu Ai.

Tracklist

 * 1) prologue
 * 2) Humming Diz♪ (鼻歌でぃず♪)
 * 3) Okkakekko Loop (おっかけっこループ)
 * 4) Shimai Aiteki Ideology (姉妹愛的意識形態)
 * 5) Marshmallow PUNCH (ましゅまろ・PUNCH) / Shimizu Ai
 * 6) Awairo noon (淡色noon) / Kawasumi Ayako
 * 7) Natsuiro no Kakera (夏色のカケラ (duet ver.)
 * 8) epoligue