Artist, webcomics creator. Formerly tagged as rainbowmaterial.
Japanese name: 斎七 (reading is given as Saishichi)
Blog name: 虹のもとブログ
https://www.pixiv.net/users/32627
https://www.pixiv.net/stacc/rainbowmaterial
https://twitter.com/sai7
https://twitter.com/intent/user?user_id=23180139
https://foundation.app/@sai7
https://pawoo.net/@sai7
https://pawoo.net/web/accounts/111124
https://rainbowmaterial.fanbox.cc
https://sketch.pixiv.net/@rainbowmaterial
https://misskey.io/@sai7
http://rainbowmaterial.blog.fc2.com
http://rainbowmaterial.web.fc2.com
http://twitpic.com/photos/sai7
http://yfrog.com/user/sai7/photos