- The Mood Whiplash at the end of Episode 10, a festival with all the girls singing a merry song... which fades to a hollow echo of their voices (as seen in countless war movies, usually before a carnage of those singing later in the movie). Given that we've been told in that very episode that they are to join the chase of Musashi as soon as they finish the festival, that was enough to send chills down many a viewer's spine, even in a show as light as this one.
- The Musashi, the second largest battleship ever built, armed to the teeth with artillery cannons and piloted by a Brainwashed and Crazy crew. It can disrupt modern electronics and carries a viral Hate Plague onboard. And nobody knows where it is.
- The Fugitive Arc. Through no fault of their own a group of high school girls find themselves on the run from charges of mutiny.
- The Totalitarian Virus, the Big Bad of the 2016 anime, itself is a notable source of this. You could be out at sea minding your own business then suddenly your crew becomes irrationally bloodthirsty, with red eyes so you can actually tell who is infected, and those who aren't infected are completely helpless to stop the mutiny before they take over the ship. The ones who detected the virus early are the lucky ones to stop it from spreading, as the Harekaze had only one notable victim (Tama) before it stopped. Others like The Musashi mentioned above is the Worst Case Scenario.
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