https://www.pixiv.net/users/1153024
https://www.pixiv.net/stacc/kxgrou
https://twitter.com/yamadakotaro
https://twitter.com/intent/user?user_id=214488719
https://sketch.pixiv.net/@kxgrou
http://doujinshi.mugimugi.org/browse/author/32070/Yamada-Koutarou/
http://www.mangaupdates.com/authors.html?id=5316
http://ja.wikipedia.org/wiki/山田孝太郎
https://www.animenewsnetwork.com/encyclopedia/people.php?id=77343
http://p.twipple.jp/user/yamadakotaro
