[Mazoku]

Originally Posted by 0000user0001

http://www.decisivearm.com/gallery003.htm
Fanart for the character, online translator says it names the source but hopefully someone who can actually read japanese will get more out of it

Ahh, thinking back I did actually get the name right when I took more effort back then, I just couldn't find any more leads. From what you've found it looks like those manga pics are from something based on the fantasy game Villgust, 甲竜伝説ヴィルガスト. https://ja.wikipedia.org/wiki/%E7%94...82%B9%E3%83%88 a Sylvie is mentioned here.

I thought the cat-people designs looked familiar but I couldn't place them, it's been a while since I saw the anime version; a couple of OVAs with a different catgirl called Ryuquir and no EC.