The author of Power of Smile.
https://www.pixiv.net/users/273771
https://www.pixiv.net/stacc/urotanc
https://twitter.com/urotanc
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https://seiga.nicovideo.jp/user/illust/227152
https://www.nicovideo.jp/user/227152
https://sketch.pixiv.net/@urotanc
http://www.doujinshi.org/browse/author/27971/
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