URLs

• https://www.pixiv.net/users/1351204
• https://www.pixiv.net/stacc/tomokatsu
• https://twitter.com/tomohirakatsu
• https://twitter.com/intent/user?user_id=170643444
• https://www.deviantart.com/katsutomohira
• http://blog.livedoor.jp/tomohirakatsu/
• http://yfrog.com/user/tomohirakatsu/photos