The space war, as we've been told, doesn't actually matter. It's a contrivance to explain why most of the men are conveniently not in Kumon-Mi. I'd go so far as to suggest that the space war doesn't actually exist at all.
The powers that be, whoever they are, isolated Kumon-Mi in a bubble that exists outside time and space, and the space war is how they hand-wave away all questions about it. It's just an excuse.
Makoto's father may not even actually be dead. They got a robocall about his death that told them to "remember to smile," which sounds like some HOPE fuckery. At the same time, Haruka gets a robocall about her husband being alive so that she feels guilt about having sex with Akira. Almost like HOPE is trying to steer Akira away from the adults and into the students.