Looking forward to starting this book on the weekend. I was looking at the front cover to work out who wrote the book.
I’m guessing that the 原作 (original work) refers to the author “shin5”.
And that 漫画 (manga) refers to the artist.
English language sites refer to the other author as “Shirako” - looking up the kanji in Jisho it looks like that could be a reading of 白虎 (even though 白虎 is normally read as びゃっこ - meaning White Tiger).
Does that sound right?