Space Brothers by Chūya Koyama A set up to volume 32! Some were bought new, and some were bought at used bookstores. The contents are clean, but there is some sun-fading. Volume 2 has a signature, but this was also purchased at a used bookstore. There are also traces of the price sticker from the used bookstore. (Please check the photos) There is also a stamp of Mutta's illustration, and although I believe it to be genuine, there is no certificate of authenticity, so its authenticity is unknown. Therefore, the price has not been significantly increased for the signature. Please understand the above before purchasing.