URLs

• https://www.pixiv.net/users/378527
• https://www.pixiv.net/stacc/ryu-dai
• https://twitter.com/ryudai_ishi
• https://twitter.com/intent/user?user_id=168504846
• https://fantia.jp/4926598213
• https://fantia.jp/fanclubs/288702
• https://pawoo.net/@ryu_dai
• https://pawoo.net/web/accounts/329276
• https://ryu-dai.fanbox.cc
• https://www.pixiv.net/fanbox/creator/378527
• https://sketch.pixiv.net/@ryu-dai
• http://www.amazon.co.jp/s/?search-alias=books-jp&field-author=石坂リューダイ
• http://www.mangaupdates.com/authors.html?id=18854
• https://cycomi.com/title.php?title_id=76
• http://dragonbig.blog.shinobi.jp
• http://file.dragonbig.blog.shinobi.jp
• https://twitter.com/ryudai0125