Zummy's circle. He has another pixiv account and webpage for his circle.
Circle name: うさねり★アイランド (USANERI IsLand)
https://www.dlsite.com/home/circle/profile/=/maker_id/RG10737.html
https://www.melonbooks.co.jp/circle/index.php?circle_id=10487
https://www.dmm.co.jp/dc/doujin/-/list/=/article=maker/id=25598
https://www.pixiv.net/users/2254030
https://www.pixiv.net/stacc/usaneri
http://usaneri.b.dlsite.net
