URLs

• https://www.pixiv.net/users/19191
• https://www.pixiv.net/stacc/ottosei
• https://twitter.com/ottosei
• https://twitter.com/intent/user?user_id=18076629
• https://sketch.pixiv.net/@ottosei
• http://ottosei.sakura.ne.jp
• http://twitpic.com/photos/ottosei