Mangaka. The author of:
Japanese name: 石坂リューダイ (Ishizaka Ryuudai)
The other name: チョコボール鷹 (Chocoball Taka)
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/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://twitter.com/ryudai0125
