URLs

• https://www.pixiv.net/users/377084
• https://www.pixiv.net/stacc/ren_takahashi
• https://twitter.com/ren_improvise
• https://twitter.com/intent/user?user_id=6715452
• https://pawoo.net/@ren_improvise
• https://sketch.pixiv.net/@ren_takahashi
• https://ren-improvise.tumblr.com
• https://www2s.biglobe.ne.jp/~shigure/
• http://improvise.rdy.jp/blog/
• http://twitpic.com/photos/ren_improvise