Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.
It is "Natsume's BOOK of FRIENDS x Hotarubi-no Mori-e special DJCD" which was given as a present to purchasers of original collaboration goods of "Natsume Yujincho San" x "Hotarubi-no Mori-e" at Comic Market 80 Aniplex booth.