URLs

• https://www.pixiv.net/users/2518613
• https://www.pixiv.net/stacc/riku_r
• https://twitter.com/2_riku
• https://twitter.com/intent/user?user_id=249148559
• http://www.h5.dion.ne.jp/~rikux/
• http://2asterisk.vivian.jp