The global climate underwent a shift, resulting in the formation of a permanent super cyclone named the Grand Roar in the Western Pacific. This event had a profound impact on the planet, causing widespread flooding in many countries. As oceanic piracy rose, shipping and navigation became critical for nations, prompting companies to hire escort cruisers to protect their investments. Enter Hyousuke Nagimiya, a skilled system engineer charged with upgrading the Pascal Magi, which is piloted by a female crew led by Captain Misaki Nanaha. Determined to prove their worth to those who dismiss them as "Alice Brand", they set out on their mission. However, they soon uncover a sinister global conspiracy seeking to exploit the new world order brought about by the climate shift.