A PC-98 joint of a naughty cult manga, Dragon Pink: The Zero Castle is an equally light-hearted adaptation, leaning in to both its satirical and adult nature. For reference, the lore of the main character states that she turned into a pink-haired catgirl by wearing cursed panties. The game meta was pretty avant garde at the time, still. Unfortunately, the role-playing game part is as bog standard as it gets, so the best parts are the nice art and, of course, the fucking. It's a PC-98 game, of course there's some hentai in there.
There are also three anime episodes, if you're captivated by the world:
(a YouTube playlist exists, but the new YouTube interface won't let me select it 😐)
