>>95887952
It's called "Arpeggio of blue steel".
It is smarter than its pretext-like plot, or his (actually bait) generic teens team look like.
(manga that is, anime is like 1% of the smart content).

A fleet of dumb but invincible shielded nanoboat appeared and drove human off the seas (why they look like WWII ships is rather pointless since they could be copying anything).

15 year later, shit is changing, the dumb uncreative nanoboat started?/were told? to create "mental model" to emulate human strategy.
Again, situation is so grim all politicians care little why the megatons terminators nanoboats who could annihilate mankind act like overexcited girls.

I'll just say it makes sense.
If you wanted to REALISTICALLY justify Geopolitical-Slice-of-Warfare with girly T1000 warship, that's how you do it.
just imagine Matrix except whoever built it lost controls of the cheated-unit it used to simulate something, and now everything is gaining sapience

But you only care for the terminator-boat Maid so here it is.