Artist.
Japanese name: 宇賀井 (Ugai)
The other names: うが (Uga) or "Yuichi UGAI"
Site name: 個人的png保管庫
https://www.pixiv.net/users/5839
https://www.pixiv.net/stacc/ugar
https://twitter.com/ugar
https://twitter.com/intent/user?user_id=6688842
https://nijie.info/members.php?id=15607
https://pawoo.net/@ugar
https://pawoo.net/web/accounts/624890
https://sketch.pixiv.net/@ugar
https://www.tinami.com/creator/profile/737
https://kojinteki.tumblr.com
http://ugar.h.fc2.com
http://ugar.fc2web.com
http://picasaweb.google.com/105458819084200425432
http://plus.google.com/105458819084200425432/posts
http://twitpic.com/photos/ugar