In the latest happy scene you can see Ami's parents' names on their grave:
Sekai Arakawa
Nozomu Arakawa
So far these are the only named characters who don't have alliterative names, right? Why is it that between all of these creepy scenes and cute girls I'm thinking about the possible significance of dead characters' names days later..?
My current head canon is that the car wreck was a lie and the space war began when aliens came to Earth and started killing everyone whose first and last names started with different letters.