GoldFinger
Another 100 chapters sounds good. Of course that's only if you can keep content flowing. I'd rather have a epilogue; then an unfinished novel. Also you should expand on that contract with the ROB. You could turn it into something interesting... Such as the ROB chooses the worlds he travels to; demanding he fulfil some form of duty as his apostle. Example- The R.O.B might take a role similar to the phoenix force; having him destroy/prune universes that pose a threat to the multiverse.
I would like himiko to die :) But no seriously, that vision that our mc gave to Night Eye? Would be quite ironic if Haru ended up self fulfilling it. Quite the twist. Beyond that, please skimp out on the multiverse, just mention it in the epilogue. Multiverse jumping is confusing, broken and there's nowhere up to go from there. It's better if you just mention it, and leave the rest to the imagination of the viewer. Besides, not a lot of people know (or enjoy) other anime worlds.