after sufficient amount of time, Chihiro will muster enough courage to start communicating with Kyousuke, and they both decide on the sort of outcome they can be happy okay with. Maybe it will take two additional cycles, maybe thirty of them. Maybe they will amount to number of years Gaku spent waiting for Yukari (if they did not already - after all, readers aren't told how long Chihiro has been doing this, which is a scary thought in itself). Then again, i think there's a chance for that here - humans are adaptable, and if external change is impossible, internal one will be considered. Not to mention the possibility of fear and-or despair being a catalyst for one - after all, there hardly are concepts more terrifying than spending eternity in a box, even if said box happens to be the size of a world.