URLs

• https://www.pixiv.net/users/105771
• https://www.pixiv.net/stacc/koyaa
• https://twitter.com/koya58
• https://twitter.com/intent/user?user_id=47068921
• https://sketch.pixiv.net/@koyaa
• http://mixi.jp/show_friend.pl?id=4037943
• http://www.geocities.jp/koya_s_m/