I was convinced the supernatural aspect was a red herring, but it seems that's not the case... or a really, reeeeally unlikely coincidence. Like, I know that Japan has a lot of earthquakes, but it's still only 3 or 4 notable quakes a year, spread across the whole country.
Also, at this point I don't think I'd be sad if Mao didn't reconcile with either her childhood friend or her crazy fangirl.