Artist, mangaka. Formerly tagged as u7 or ultra-seven.
Japanese name: 渡辺 ゆうな (Watanabe Yuuna)
The other name: U7 (ultra-seven),ちょかた (Chokata)
Circle & site name: 逆乱堂 (Gyarandoh)
https://www.pixiv.net/users/24159
https://www.pixiv.net/stacc/ultra-seven
https://twitter.com/yunyunyuna
https://twitter.com/intent/user?user_id=161239842
https://seiga.nicovideo.jp/user/illust/3738535
https://www.nicovideo.jp/user/3738535
http://piapro.jp/yunyunyuna
http://www.ustream.tv/user/ultrasevenseven
http://p.twipple.jp/user/yunyunyuna
http://twitpic.com/photos/yunyunyuna
