Artist, illustrator.
Japanese name: 原 建人 (reading is given as Hara Takehito)
The other names: はらけん (Haraken) or 五拾八式 (Gojuu Hachishiki or Gojuu Hasshiki)
Circle name: CalmCradle
https://www.pixiv.net/users/3433503
https://www.pixiv.net/stacc/type58
https://twitter.com/hageran
https://twitter.com/intent/user?user_id=17657544
https://seiga.nicovideo.jp/user/illust/182727
http://dic.nicovideo.jp/u/182727
https://www.nicovideo.jp/user/182727
https://gl3vgzs9.fanbox.cc
https://www.pixiv.net/fanbox/creator/3433503
https://sketch.pixiv.net/@type58
https://www.tinami.com/creator/profile/6701
http://calmcradleblog.blog.fc2.com
http://www.amazon.co.jp/s/?field-author=原+建人&search-alias=books-jp
http://c10000385.circle.ms/oc/CircleProfile.aspx
http://c10033350.circle.ms/oc/CircleProfile.aspx
http://hara_ken.at.infoseek.co.jp
http://pixiv.cc/haraken3
https://www.pixiv.net/users/2313
https://www.pixiv.net/stacc/haraken3
http://twitpic.com/photos/hageran