Donmai
nishizumi miho, itsumi erika, akiyama yukari, katyusha, nonna, and 2 more (girls und panzer) drawn by iteza_(flapper_girl_25)

Artist's commentary

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    It's the 5th Force!

    A calm and precise explanation by the experts.


    The 5th force refers to something outside the 4 fundamental forces of physics: gravity, electromagnetism, strong, weak.
    　
    Wikipedia: Fifth force