This disc was released with a comic, which included some piano sheets for the vocal tracks.
There is no indication of a catalogue number, but the one I entered into the field comes from Suruga-ya. If needed, the ISBN-10 is 4062088770.
Issei Miyazaki [宮崎一成]:
Code:
http://www.animenewsnetwork.com/encyclopedia/anime.php?id=126
Sources:
Code:
http://www.suruga-ya.jp/product/detail/120007987000
http://oldcrows.net/~rabi/CCS/cd/comics.html
http://www.7netshopping.jp/books/detail/-/accd/1101834314/