Artist.
Nickname: kuuichi09 (くーいちまるきゅー, Kuuichi Marukyuu)Circle & old site name: 揺れる猫機械 (Yureru Neko-kikai)Site name: ゆれぬこましーん (Nurenuko Machine)
(He has some private accounts, too. They're not related to danbooru though.)
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