Artist.
Japanese name: コツカ
Circle: 少年舎
Circle member: U's, コウキ, 鷹寛, 小渕 恵一
https://www.pixiv.net/users/475173
https://www.pixiv.net/stacc/kotsuka
https://twitter.com/kotsuka1990
https://twitter.com/intent/user?user_id=209603763
https://kotsuka.fanbox.cc
https://sketch.pixiv.net/@kotsuka
http://shounensha.blog.fc2.com
http://shounensha.web.fc2.com
http://c10008405.circle.ms/oc/CircleProfile.aspx
http://p.twipple.jp/user/kotsuka1990
http://twitpic.com/photos/kotsuka1990
