I'm been thinking for some while... But with
Jigoku Youchien a possibility, I think a group like Kadokawa would not lose this opportunity.
I mean, they already have ASCII Media Works, Fujimi Shobo, Enterbrain, and Media Factory other than Kadokawa Shoten, and they control most of the LN market.
So anyway, do you think it's possible to have a light novel crossover project?