URLs

• https://www.pixiv.net/users/1419543
• https://www.pixiv.net/stacc/redriaredria
• https://x.com/kouchaya_kotora
• https://x.com/i/user/1083708265257623552
• https://sketch.pixiv.net/@redriaredria
• https://www.mangaupdates.com/authors.html?id=4740
• https://www.melonbooks.co.jp/circle/index.php?circle_id=18813
• https://ec.toranoana.jp/tora_r/ec/cot/circle/2UPA1B6P8U72d46Pd687/all
• http://www.coremagazine.co.jp/comic/comic/otsuka_kotora
• https://www.dlsite.com/home/circle/profile/=/maker_id/RG09509.html
• https://www.dmm.co.jp/dc/doujin/-/list/=/article=maker/id=28592
• https://dl.getchu.com/search/dojin_circle_detail.php?id=4781
• http://kouchaya.x0.com
• http://www.doujinshi.org/browse/author/3199/Ohtsuka-Kotora
• http://www11.plala.or.jp/kouchaya