https://www.pixiv.net/users/898006
https://www.pixiv.net/stacc/ryuryo
https://twitter.com/RyoRyu
https://twitter.com/intent/user?user_id=509964933
https://seiga.nicovideo.jp/user/illust/3983543
http://com.nicovideo.jp/community/co133973
http://dic.nicovideo.jp/a/りょう(絵師)/
http://www.nicovideo.jp/mylist/11377585
https://www.nicovideo.jp/user/3983543
