I had no intention of buying this, and in fact, I did NOT buy this. A Momoi fan in Japan bought multiple copies of this in order to attend her event multiple times and so he gave me the extra copy. I told you the otaku business over there is closer to extortion than business.
Audio quality is, well, what do you expect?
There are far too many mistakes in the jacket / booklet design. They used a kanji in Haruko, which shouldn't be there, there is an extra 'i' in Kadowaki Mai's name, and Ikezawa Haruna is spelled with an 'l' and 'r' once each on the back of the CD. They don't care about the sound quality, which implies they don't care about the music, and they don't even care about the physical production of the CD. What do you think they care about? Money, of course. It didn't used to be this bad.... I wonder what happened.
From top to bottom, left to right, Ikezawa Haruna, Gotou Yuuko, Shimizu Kaori, Momoi Haruko, Tanaka Rie, and Kadowaki Mai.