High School Fleet Movie (2020) Characters, Setting & Themes Explained

The movie takes place across major Japanese port cities including Yokosuka, Kure, Maizuru, and Sasebo. These locations are known for their naval bases and shipyards. The story unfolds at sea, on docks, and aboard flotillas and sea fortresses, with the ocean serving as the primary battlefield.

• yokosuka
• kure
• maizuru
• sasebo
• naval bases
• port cities

The story takes place approximately 100 years after tectonic shifts submerged a significant portion of Japan. This created a world where Marine Cities were established to preserve the nation's territories, and the sea became central to daily life and defense.

• future
• japan
• submerged
• marine cities
• time period

The Blue Mermaids are an elite naval force formed to protect Japan's vital sea lanes and ensure their smooth operation. Becoming a Blue Mermaid is a prestigious career coveted by young women. These skilled cadets live by the sea, protect it, and journey across it while training to become the next generation of maritime guardians.

• blue mermaids
• navy
• maritime
• coast guard

Akeno Misaki (real name Shiina Natsukawa) is a capable and determined crew member aboard the Harekaze II. She possesses strong leadership potential that strains against Mashiro's ambitions as captain. During crises, she pushes the crew to act decisively while grappling with her own role on the ship.

• akeno misaki
• shiina natsukawa
• leader
• crew member

Mashiro Munetani (real name Lynn) is an ambitious and capable sailor whose lifelong dream is to become captain. She actively seeks experience and earns the crew's respect through steady performance, collaboration, and a willingness to take risks for the team during the crisis.

• mashiro munetani
• lynn
• captain
• ambition

The film centers on the tension between Akeno and Mashiro as the crew debates who should captain the Harekaze II. The story explores what it means to be a leader, the responsibility that comes with command, and the personal growth that emerges when characters step into a captain's shoes. Rivalry and mentorship push both characters to prove themselves through action.

• leadership
• captain
• responsibility
• growth
• command

The Blue Mermaids, other high school fleets, and the all-male White Dolphins must unite to tackle pirates and a fortress threat. The story highlights how diverse crews coordinate, share skills, and rely on trust under pressure. Collaboration across different schools becomes essential for executing complex naval maneuvers.

• teamwork
• collaboration
• white dolphins
• united fleet

The cadets confront pirates who hijack floating facilities and take hostages, threatening both civilian safety and naval operations. The students must improvise daring infiltrations and rescue missions while facing large-scale naval assaults. The story emphasizes calculated risk, using wit and courage to disable threats from within.

• pirates
• hostage
• threat
• combat
• naval battle

Susan Reyes is a foreigner who is coerced by pirates in exchange for help locating her father in Japan. Her knowledge of the pirate plan becomes pivotal to the mission. Despite her circumstances, she resolves to collaborate with the student cadets to thwart the pirates.

• susan reyes
• foreigner
• pirate
• father

Moeka China (real name Sora Amamiya) is a member of the Blue Mermaids who joins the joint mission against the pirates. She offers practical seamanship and loyalty to the team. Her presence strengthens the team's cohesion as they coordinate with other schools to thwart the pirate threat.

• moeka china
• sora amamiya
• blue mermaids
• seamanship

Marine Cities are settlements established around 100 years after tectonic shifts submerged much of Japan. These coastal cities were created to preserve the nation's territories in the new maritime world. They serve as hubs for naval operations, commerce, and the training of maritime defenders.

• marine cities
• japan
• submerged
• coastal settlements

The movie explores three core themes: Leadership, as characters navigate power dynamics and step into command roles; Teamwork, as diverse crews must unite despite differences to face common threats; and Courage, as students confront danger with calculated risk, resilience, and the resolve to protect others.

• themes
• leadership
• teamwork
• courage