High School Fleet Movie

The Harekaze II crew welcomes students from Kure, Maizuru, and Sasebo maritime high schools for the inter-high tournament in Yokosuka. The students explore stalls set up by their classmates as part of the welcome festival. During the festivities, Akeno Misaki and Mashiro Munetani befriend a foreign student named Susan Reyes.

Akeno Misaki and Mashiro Munetani deepen their friendship with Susan Reyes, the new acquaintance from the festival. The trio begins to form a tighter bond as they participate in school activities. Susan's presence adds new layers to the group dynamic moving forward.

School instructor Kaoru Furushou discusses a recommendation from the crew of Hiei to promote Mashiro as captain. The idea creates tension and uneasiness between Mashiro and Akeno, who has been taking the lead so far. The discussion highlights the expectations and responsibilities ahead of the inter-high tournament.

The following day, Blue Mermaids receive a report that a floating water purification plant and a sea fortress have been hijacked by pirates who plan to turn them into a mobile sea base. The city faces a looming threat as the pirates reposition the facilities for their operation. The news sets the stage for the coordinated mission involving multiple high schools.

Susan infiltrates the massive float, a target scheduled for scrapping, to block Blue Mermaids from leaving the harbor. Her action adds urgency to the unfolding crisis and deepens the stakes for the fleet. The infiltration foreshadows the pirates' coercion and Susan's personal backstory.

In a hospital, Susan admits she was coerced by pirates into helping them search for her father in Japan. She explains the pirates' pressure and how it shaped her decisions. The confession ties her fate to the broader battle against the pirate operation.

Akeno, Mashiro, and Moeka China join the Blue Mermaids and other girls' maritime high schools in a mission to stop the two floating facilities from rendezvousing. The combined fleets prepare to intercept and disrupt the pirates' plan. The operation marks a coordinated effort across multiple schools.

Benten and Admiral Graf Spee successfully rescue the hostages aboard the plant and capture the pirates. Their action frees captives and disrupts the pirates' operation. The rescue strengthens the coalition of the Blue Mermaids and high school fleets.

Blue Mermaids and the high school fleet join the all-male White Dolphins in their assault on the fortress. The combined forces press the attack as the fortress returns fire. The battle escalates, testing the crews' coordination and resolve.

As the fortress fires back, Akeno decides to infiltrate the fortress due to Harekaze II's size allowing it to pass through a small hole opened by bombardment from four Yamato-class flagships. Her plan relies on stealth and exploiting the breach to reach critical interior areas. The move signals a shift from direct assault to a targeted infiltration.

With Susan's knowledge of the fortress interior, Harekaze II successfully disables the fortress from within. The operation cripples the pirates' base and frees the remaining hostages. The crew's teamwork and Susan's insider information prove decisive.

After the mission, Mashiro tells Akeno that she wants to stay with the crew to gain more experience while still aiming to become a captain. She expresses commitment to continued training and leadership under the Blue Mermaids' banner. The revelation solidifies the evolving bond between the two and sets Mashiro's future path.