Artist.
Japanese name: 杉山 一郎
https://www.pixiv.net/users/2663699
https://www.pixiv.net/users/24381010
https://www.pixiv.net/stacc/sugiyama18
https://www.pixiv.net/stacc/sugiyama23
https://twitter.com/sugiyamadesu
https://twitter.com/intent/user?user_id=993400939510878208
https://seiga.nicovideo.jp/manga/list?user_id=11873112
https://seiga.nicovideo.jp/user/illust/11873112
https://www.nicovideo.jp/user/11873112
https://pawoo.net/@sugiyama23
https://sketch.pixiv.net/@sugiyama18
https://sketch.pixiv.net/@sugiyama23
http://sugiyama23.web.fc2.com
https://www.pixiv.net/stacc/gizaryo
https://twitter.com/sugiyama2014
https://twitter.com/sugiyamaichizi
https://twitter.com/intent/user?user_id=2474099850
https://twitter.com/intent/user?user_id=996750008325033984
