Kagepro creator and writer Jin WAS AND IS involved with writing for the Kagepro manga.
from this interview, 2k16: http://x0401x.tumblr.com/post/178499525294/
Ene: Now, Jin-san, //about the fact that /you are in charge of the manga/ "Kagerou Daze"//... speaking frankly, aren’t you slacking?
Jin (2k16): No, it’s not like I’m slacking. /In order for us to continue with the series named “Kagerou Daze” in an even more interesting way, we’re going through all sorts of preparations./
Ene: Hoho. What would that be, specifically?
Jin: “Kagerou Daze” has related works beside the manga. For example, in the novel, anime, etc., /the stories have developments completely different from the manga/. I’m //aiming for a means to have people enjoy them through /delicately/ /interconnecting/ these series /and the manga/ "Kagerou Daze"//, which is why we’re taking a publication break (*this was in 2k16). The latest novel volume will also be released at the end of August (2k16), though...
Ene: Heeh~. I don’t get it all that well, but you’re being pretty damn complicated with that novel and anime stuff, huh?
Jin: Yes. I’m often told so.
Ene: By the way, //is this work something you couldn’t have done while /maintaining the serialization/ of the manga//? //Isn’t /YOUR WORK PACE/ a bit too slow!?//
Jin: I have no words to reply with.
Ene: Hey, is there anything you want to say to the readers?
Jin: I am really sorry...
CERTAIN PARTS OF KAGEPRO FANDOM, 2k19: anyway, Jin isn't involved with the manga at all ,,,,, ,,,,, ,,,,,,
those of us who knew ALL ALONG that HE IS:
those of us: STOP. SPREADING. MISINFORMATION. /PLEASE/