Blog: http://pinkdrain.blog.fc2.com/
Pixiv: http://www.pixiv.net/member.php?id=35162
Twitter: http://twitter.com/s_kazasa
MangaUpdates: https://www.mangaupdates.com/authors.html?id=1544
The Doujinshi & Manga Lexicon: http://www.doujinshi.org/browse/author/3187/Sumita-Kazuasa/