Mangaka. The author of the Koha-Ace series.
Is the reason why Medusa is always featured in Fate/Grand Order's GUDAGUDA events (either as a cameo or featured in a Craft Essence), because he is a man of exquisite taste and culture.
Pen-name: 経験値 (Keikenchi)
Circle name: 経験値ランド (Keikenchi Land)
http://dic.pixiv.net/a/経験値(漫画家)
https://twitter.com/keikenti
https://twitter.com/intent/user?user_id=128289750
https://www.amazon.co.jp/s?rh=p_27%3A経験値
http://ja.wikipedia.org/wiki/経験値_(漫画家)
https://www.animenewsnetwork.com/encyclopedia/people.php?id=123575
http://store.line.me/stickershop/product/1465324/
https://myanimelist.net/people/41709
http://keiken777.blog.fc2.com