Previous thread >>3951093

Website:
http://www.alles.or.jp/~uir/index1.htm

Twitter:
http://twitter.com/crimson_3

pixiv:
http://www.pixiv.net/member.php?id=772642

Crimson Sexual Coliseum online game:
http://www.dmm.co.jp/netgame_s/crimson

Some gameplay info:
http://www.hongfire.com/forum/showthread.php/80308-Crimson-Hard-Comics?p=3630102#post3630102

Also, check the archives for gameplay logs and other info: https://archive.moe/h/search/subject/crimson%20comics

Useful search terms: クリムゾン, クリムゾンコミックス, カーマイン, クリ姉 (nickname by Japanese fans)