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I think the first thing they should do is to decide on the setting and build the story from there on. Some decent world-building is always welcome, and it could also give them the freedom to do more than just stick to the events of the Pacific War. Show also the effects of the Abyssal Fleet dominating the ocean, like embargoes placed on maritime nations and how they affect these nations, and the consequences of introducing the ship-girls as the solution to the Abyssal problem.
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