Question:
What even is the space war? If the world is at a loop, then is outer space the same as well? Considering that Makoto's dad died a few months (?) before, then I guess he's already dead at every reset?
The space war, which Ami tells us to ignore, seems to be implied to be the outside world facing whatever is actually behind Kumon-mi.
Makoto's dad seems to have just now died, and with how time seems to work differently in certain places, it's possible that Makoto's dad was fighting since the resets started and just now got killed in the real world. The thousands of years that's gone on in Kumon-mi possibly being only days or months in the real world.
Overall: No one really knows yet.
AmIOkay Maya has seemed to claim everything is already gone though:
And "the world" was apparently excited the day Makoto found out her father died:
With Yasu also claiming those within the world will burn:
So, whatever the "space war" is, it doesn't sound good for those outside Kumon-mi, or for those within it.