I had funny thoughts about this. Truly, they’re musketeers, "One for All, All for One," and I’m not sure who the underdog is here anymore. I think this would’ve been less complicated if they hadn’t associated the characters with historical figures. The historical weapons alone could’ve been enough. My point is, there are anime that feature historical figures, like the Shinsengumi in Samurai X and Gintama. Yet those shows managed to leave a lasting impact despite their different genres. Here, I think it’s because the excessive introduction of characters led to a convoluted plot.