There are two releases, the regular edition and the limited edition, and which one this entry was supposed to be?
http://www.marine-e.co.jp/sakuhin/august/fa/chara_song/
Regular Edition: 3,150 yen MSG-0018 1 Disc
Limited Edition: 4,000 yen MSG-0018_ 2 Disc
The scan gallery includes
the obi stating the price was 3150 yen, and
the second disc. The catalog number is also puzzling. Besides the alleged underscore of the limited edition,
why "MMCC-4199" is printed on the box?