Artist Sumi Keiichi, aka penzen. His works of note, are buront art that would be used in the iron of yin and yang videos and various MUGEN-related works.
https://www.pixiv.net/users/357248
https://www.pixiv.net/stacc/penzen
https://twitter.com/SumiKeiichi
https://twitter.com/intent/user?user_id=153952250
https://seiga.nicovideo.jp/user/illust/653038
https://www.nicovideo.jp/user/653038
https://sketch.pixiv.net/@penzen
http://penzen.blog.fc2.com
https://ja.wikipedia.org/wiki/純珪一
https://min.togetter.com/Ufds6rB
