Takarakuji De 40-Oku Atattandakedo Isekai Ni Ijuu Suru - Chapter 30 I'll do my best

Valetta is way too smart. Like uber genius level. Also she now basically has super-strength. And that’s well and good but now she is using that intelligence to build weapons. In this case a scorpion, which is a type of ballista. (it’s also a tank but that’s halo)

Also this way this idiot MC is talking about wars with her is so vague, he doesn’t even mention the huge multi-nation organization that prevents his country from being invaded by the Chinese (trust me they would love to get some payback for WW2).

Anyways, there are plenty of wars since WW2, Japan simply hasn’t been allowed to participate in them. Also they lost quite a bit of their taste for war after being the first ones to have nukes be used against them and thus becoming the cautionary tale.