According to information from some auction website https://www.suruga-ya.jp/kaitori_detail/187001294, they are CG sets of あしゅらバスター (Ashura Buster) series by circle 来夢緑 (Lime Green): (The cg sets are so old (floppy disk) that I couldn't find info from their website though) http://www.dlsite.com/maniax/circle/profile/=/maker_id/RG14299.html http://limegreen.kir.jp/
mitsuru ashura might be an artist, but a link proof would be nice
In https://e-hentai.org/g/494130/0bd9df1f1f/ the story is tagged as a Urusei Yatsura parody, character being Shinobu Miyake. Probably this is right, but I'm not 100% sure.