Doujin circle, mainly creates card game-themed products (card sleeves, playing mats & etc.).
The true illustrators' names are written on the tweets.
Circle name: RINGOEN
Current leader: 春乃りんご (Haruno Ringo) (probably Moni_(cRedo)'s pseudonym)
https://www.pixiv.net/users/26991444
https://www.pixiv.net/stacc/user_ycdd2583
https://twitter.com/IZUNN_mirage
https://twitter.com/RINGOEN_Apple
https://twitter.com/intent/user?user_id=1410941238
https://twitter.com/intent/user?user_id=962621274735325184
https://ringoen.booth.pm
http://projectrja.web.fc2.com
http://portal.circle.ms/Circle/Index/10357351
http://webcatalog.circle.ms/Perma/Circle/10357351
