Ipod is fine =P
And Yui/Yue and Raike are just in an alternater dimension of the same area, right? So just have them pop back in where they were when they left, which I think is either right outside the door of the house or in the kitchen again
True. However, we assume Odessa meant in her future; the future she is in currently. She already said that she hanged out with Nightmare and if Miharu died, Nightmare would be not be hanging around; he'd be beside himself with grief and probably leave to his home region. He probably would not have been doing crimes and as such, Odessa and Nightmare would never had any partnerships. So, in any case, Miharu has to be one of the ones alive for sure. Well, now since you know this information.
And you can't really kill immortal!Miharu off, considering that Yue and Yui are still clones of the real!immortal!Miharu, even if they do get turned into zombies; real!immortal!Miharu can still make more. XD