I can see the confusion since it seems like this comes out of left field with no context but it has historical connotations.
At the close of WW2 whilst Japan was being bombed round the clock with invasion looming, young students including girls were being organized into a sort of last ditch defense force. Many weren't even given rifles and were expected to throw primitive hand bombs made of gunpowder in a pottery shell ignited with a match and wick or even wield bamboo spears. It was a truly hopeless situation that thankfully never progressed to inevitable slaughter thanks to Japan finally surrendering.
I would guess that this comic is an homage to that in a modern setting.
I love this.
It's fine to just show that twist all of sudden, you know? It's short, and it's called twist for a reason.
The dirty building and furniture actually give me an idea that something bad is happening, so eh.