This is the official artbook from the Succubus Quest development team Most of them are simply printed version of the game's own field guide But there are some printed version exclusive species. Although contents are from the adult game, the artbook itself is non-nude
This is the only version I can find on web However, both on amazon.jp and doranoana webstore, the artbook is out of stock and no sign of re-stocking, no E-version available too. To make things worse, SQDT seems to have stopped their activity since C78.
Base +8, nyfair +15, Sushilicious +28, Eijhu +8, Nayabel +7