
I'm just waiting for the possibility of Eve LITERALLY going berserk when Gozu unexpectedly returns to his world... Imagine insane Eve cracking through space and time into Gozu's world just to bring him back

His "soul" can be transferred to another person's dying body in the original world (a temporary amnesia arc is optional here but it's better to have it to have some of our heartstrings pulled along the way).
This way, it'll make it more difficult for Eve to locate the real Gozu and get him back hehehehehehe
This had some potential to be the contractual lovers to actual lovers trope but the abrupt ending off-putting and inconclusive ...