Yokosuka Girls’ Marine High School has an opposition occasion among the various schools, and Akeno’s class winds up putting on an assortment of displays. While monitoring her schoolmates, Akeno and Mashiro run into Susan “Sue” Reyes, a secretive young lady with an unmistakable fascination for maritime fighting. Mashiro is later reviewed and given the choice of turning into the commander for an alternate vessel, leaving her inclination clashed: on one hand, she needs to utilize her extensive aptitudes and lead her own team, however on the other, she’s gotten partial to working close by Akeno. Mayuki takes note of that Mashiro needn’t surge her choice, and keeping in mind that concluding whether to acknowledge this advancement, she and Akeno run into Sue once more, who’s set up camp. They go through the night with her, and the following day, rivalry starts decisively, despite the fact that Akeno’s class charges ineffectively during the occasions. Afterward, Akeno and Mashiro contend in a reproduced fight competition; the two are equitably coordinated, despite the fact that the finals is stopped when it is uncovered that Sue had secured a flatboat and pulled one of the counterfeit islands to the harbor’s passage, closing it off. Miyuki and Mashimo, then, talk about a concerning advancement: privateers have held onto control of both a Plant Ship and have involved the Sea Fort, a versatile sea borne post. On the off chance that the privateers were to effectively re-visitation of the Sea Fort with the Plant Ship and its assembling offices, it would give them an enormous preferred position. Incidentally, Sue, looking for her dad, had been offered an arrangement: the privateers expected for her to close off Yokosuka Harbor and keep the Blue Mermaids from sending to do their arrangements. Due to her extraordinary information on the Sea Fort, Sue is approached to go with Moeka and the Musashi on an activity to stop the privateers. Akeno and Mashiro get consent to foray, too, in the wake of persuading Mayuki that they would have the option to help. Alongside different schools, the Harukaze sets off. The Blue Mermaids effectively recover the Plant Ship and secure the prisoners, killing the lead privateer ready. Notwithstanding, the privateers on board the Sea Fort request the arrival of the Plant Ship to them, else, they will cruise into Tokyo hold and cause harm on the city utilizing the Sea Fort’s weaponry. In spite of concentrated fire from the Yamato class vessels from the consolidated secondary school armadas, the White Dolphins neglect to stop the Sea Fort: the opening punched into the Sea Fort’s body is excessively little for their vessels to enter. Akeno volunteers the Harekaze, and facilitate with Moeka’s Musashi to arrive at the Sea Fort’s frame. Sue sheets the Harekaze to help explore, as she knows about the Sea Fort’s inward design. The team utilize their resourcefulness to overcome the Sea Fort’s interior safeguards, and Rin winds up steering a controller bomb into the Sea Fort’s fundamental generator, effectively immobilizing the sea borne stronghold. Their break course is obstructed by garbage, yet Mashiro’s activities take into consideration the course to be cleared. The Harukaze effectively re-visitations of the others, and in the result, Mashiro concludes that, while captaincy is something that she might want to do, she would like to work with Akeno and keep learning as to be a more competent chief when she gropes prepared take such a job.