Horiizumi Inko (堀泉インコ, romanized as Inco Horiizumi on their personal site), author of Itoshi no Karin.
https://www.pixiv.net/users/428282
https://www.pixiv.net/stacc/mini
https://twitter.com/incoty
https://twitter.com/intent/user?user_id=932733811
https://www.tinami.com/creator/profile/6773
http://cozirow.blog.fc2.com
