Found some rare Suikoden II concept arts here
. I asked about the book, the ISBN or something, but as they say in the source blog the name on the front only says “GENSOSUIKODEN II ART WORKS” and it also says “not for sale”… apparently it came with certain copies of Suikoden II in Japan.
According to theirstar
“Konami simply call it a promotional booklet (販促用小冊子).It has no ISBN (…) Its listed release date (17/12/1998, the same as Suikoden II) seems to confirm this -that they came with the game-“