Um, I don't think anyone knows for absolute certain. xD I guess it's up to the mangaka!
There's been a few arguments over it, some people have even said the creator was dead? It's confusing right now. But I do know the mangaka is still alive.
So I guess we'll just have to wait and see?
According to baka updates the manga is complete but the scanlator didn't translate the extra chapters so the site has it as ongoing.
Here is the link:
https://www.mangaupdates.com/series.html?id=59743
My anime list says the same 7 chapters is all.
http://myanimelist.net/manga/31115/Kohitsuji_Project
Aah thank you :D!
I see that in chapter 7 it has final marked on it yet the manga is said to be incomplete. Is it completed or not I am confused?