So okay, in the beginning, it looked like some video game. Anyway, this series is definitely way better than Upotte!!. Though the thing I don't really get is that the time and setting is not really explained. Is it around in World War II or somewhere near the present or the past?
Another thing is how the series explains why there are random school girls in Axis tanks which seems to be randomly ridiculous. Are they even being trained for some war or to be a good woman is to drive a random Axis tank? Other than the story and settings, there's also seem to be too much slice and life drama or just over. Wrapping things up, I'll probably watch the next episode and see.
Conclusion: Weird setting/story and might probably continue to watch it.