@BloodySorcerer
Warcrimes, as far as using biological warfare, don't differentiate between soldiers and civilians. Using sarin gas is bad regardless of whether it's enemy or civilian.
And making waters undrinkable by "booby trapping" them is a war crime according to Geneva. Check the poster the translating group whipped up. It doesn't matter if they can recover it, using food or water as bait to spread disease is biological warfare.
And this is all a separate matter, but this speaks volumes about Kaoru - she's immoral as fuck, if she's a Japanese-born person fully aware of what war and war crimes are, but has no issues doing it to torture these people.