Artist.
Japanese name: 紫心 (Shishin)
Circle name: 紫心亭 (Shishin-tei)
The other circle name: 紫心庭 (Shishin-tei)
https://www.pixiv.net/users/5295820
https://www.pixiv.net/stacc/brs_tuki
https://twitter.com/brs_tuki8
https://twitter.com/intent/user?user_id=607411833
https://seiga.nicovideo.jp/user/illust/21758525
http://com.nicovideo.jp/community/co2215569
https://www.nicovideo.jp/user/21758525
https://nijie.info/members.php?id=764974
https://pawoo.net/@brs_tuki8
https://pawoo.net/web/accounts/196693
https://brstuki8.fanbox.cc
https://sketch.pixiv.net/@brs_tuki
https://sketch.pixiv.net/@tatsuya_ishikawa_790
https://ask.fm/brs_tuki8
http://webcatalog.circle.ms/Perma/Circle/10340594
https://www.pixiv.net/stacc/tatsuya_ishikawa_790
http://p.twipple.jp/user/brs_tuki8