Story thoughts.
I am guessing that Mira is also not the Mira of the Bethany in the hotel.
Mira mentioned not seeing MC for a few years, but the accident supposedly happened the previous year.
She also doesn't act like he might have died, just that they spent time apart.
She lives with the mother and never mentions not living with her. So she would know about the accident and the deaths and have no reason not seeing MC before his death.
MC and Beth both also mentioned the father figure died, but Mira again never mentions death.
What does this mean? MC and Beth are opposite sides of the same coin, with similar events just different outcomes.
Mira on the other hand doesn't have an equal but opposite yet. So is she from a world where it was her fault everyone died? Or did no one die and she just ended up here somehow?
MC killed his family, Beth killed her family, Nara killed a bunch of people, Iggdra wasn't around and her clan was killed.
Train Girl, Eva, Laurie, Grandma, and new girl are still yet to be uncovered. If it has anything to do with a dead realm, being it looks like an apocalypse happened.