For a Hissatsu (jidaigeki) character, use Masa_(Hissatsu) tag.
Artist.
Japanese name: かじやのマサ (Kajiya no Masa)
The other name: 水前寺 薊 (Suizenji Azami)
Circle name: メタル・ネック (Metal Neck) (the other member: Yuuki Daisaku)
https://www.pixiv.net/users/390776
https://www.pixiv.net/stacc/kajiya123
https://twitter.com/kajiya_no_masa
https://twitter.com/intent/user?user_id=1729290704
https://seiga.nicovideo.jp/user/illust/841174
https://www.nicovideo.jp/user/841174
https://sketch.pixiv.net/@kajiya123
http://webcatalog.circle.ms/Perma/Circle/10093039
http://www.toranoana.jp/mailorder/article/04/0030/63/47/040030634713.html
http://www.toranoana.jp/mailorder/cot/circle/64/66/5730373336363634/a5e1a5bfa5eba1a6a5cda5c3a5af_01.html
http://www.geocities.co.jp/Playtown/6155/
http://twitpic.com/photos/kajiya_no_masa
