Since the attached .txt has no interest in actually giving proper credit, the game the assets are stolen from is 真章 幻夢館/Shinshou Genmukan. The art is by Tony Taka. I very much question the use of the term 'salvage' and vague links to the internet archive when this information is available with a reverse image search, the game is still purchasable on some digital storefronts, and despite the diskmaster archive's claim, is from well after the internet, and post-dates VNs like Fate/Stay Night and Clannad, which I very much doubt anyone would want to claim to have 'salvaged' the artwork of. While this is a freeware game and I don't think the devs are seeing a cent of those sales at this point, more proper credit would go a long way.