Hakuchou
I just had a thought... What we have in this storyline is the idea of privateers or licenced pirates. We have backstory about the Hakuchou, the seven original ships operating under Letters of Marque.
Japanese storytelling is replete with tales of masterless ronin, samurai who call no man lord living in a world where they are effectively "beyond the pale" although they still possess some rank and status. You could consider the privateers of the Mo-retsu universe as effectively being space ronin. And there are seven of them. Hmmm, where have I seen that plot before?
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