Yuji Kaku's Episode 1-10 Illustrations : r/jigokuraku

Yuji Kaku's Episode 1-10 Illustrations : r/jigokuraku

ART] Hell's Paradise: Jigokuraku New Illustration by the author (Yuji Kaku) : r/manga

Hell's Paradise: Jigokuraku

Hell's Paradise: Jigokuraku

Hell's Paradise - Jigokuraku Vol 1-13 (END) English Comics Edition Japanese Man

Hell's Paradise: Jigokuraku, Vol. 10

Hell's Paradise: Jigokuraku

ART] Hell's Paradise: Jigokuraku New Illustration by the author (Yuji Kaku) : r/manga

New Yuji Kaku Illustration of Jikka : r/jigokuraku

비드바이코리아 - 해외 전문 경매대행 선두주자 - BIDBUY

Hell's Paradise: Jigokuraku by Yuji Kaku -Trade Paperback - Teens Comics & Graphic Novels

demifiendrsa.tumblr.com - Tumbex

I am just curious about what Yuji Kaku is using to color his work. It doesn't look copic markers that most of the mangakas are using. What do you guys think?