Artist.
Japanese name: 倖月 蛍 (Kouzuki Kei, the artist uses this spelling: "Kohzuki Kei")
Old name: カズサ (Kazusa)
https://www.pixiv.net/users/25664322
https://www.pixiv.net/stacc/user_ezjc5742
https://twitter.com/kohzuki_kei
https://twitter.com/intent/user?user_id=529319551
https://sketch.pixiv.net/@user_ezjc5742
https://www.mobygames.com/person/1204263
https://twitter.com/_0576861614433
http://twpf.jp/_0576861614433
http://twpf.jp/kohzuki_kei
