Hiromi Kuroki is a female supporting character in High School Fleet, serving as an engine assistant aboard the destroyer Harekaze and known by the nickname Kuro-chan.
Hiromi Kuroki is from Choshi, Chiba Prefecture, and is the childhood friend of Maron Yanagiwara.
At 169 centimeters tall, she is the tallest member of the Harekaze class.
She belongs to the engineering department and works as an engine assistant.
Cool and composed on the surface, she also has a deeply passionate side and tends to throw herself completely into whatever captures her interest.
Hiromi first met Mashiro Munetani at a Blue Mermaid event and became strongly inspired by her.
That admiration led her to apply to Yokosuka Girls' Marine High School so she could attend the same school as Mashiro.
Personal data
Name: Hiromi Kuroki
Gender: Female
Nickname: Kuro-chan
Affiliation: Engineering Department
Role: Engine Assistant
School: Yokosuka Girls' Marine High School
Birthday: November 1
Birthplace: Choshi, Chiba Prefecture
Height: 169 cm
Blood type: O
Preferences and abilities
Hobbies and special skills: Stretching, soy sauce making
Favorite foods: Cinnamon toast, cinnamon cake, toast
Disliked food: Green peppers
Favorite color: Cream
Best subject: Chemistry
Weakest subject: Japanese language
Qualifications and achievements
Hiromi won first place in the individual middle school division of the Choshi City Girls' Sumo Tournament.
She also holds qualifications including Second-Class Maritime Officer License for engineering at the middle level, First-Class Juvenile Boiler Engineer, Pyrotechnics Consumption Safety Handbook, and Class B Hazardous Materials Handler licenses for Categories 2 to 4.
Voice actress
Voice actress: Natsuki Aikawa
Hiromi is often described as calm, cool, and dependable.
According to Maron Yanagiwara, she is steady and kind, and someone Maron has always wanted to remain close to.
Despite her composed image, Hiromi is also intense and single-minded.
Once she becomes interested in something, she pursues it obsessively.
As a child, she became fascinated with homemade soy sauce after visiting a soy sauce factory.
Later, seeing a diesel locomotive sparked her love of machinery and mechanical tinkering.
This tendency also shaped her future path.
While uncertain about her career during middle school, her meeting with Mashiro Munetani at a Blue Mermaid festival and again at the entrance exam venue gave her a clear goal and inspired her to become a Blue Mermaid.
She is knowledgeable not only about machinery, but also about fuel, lubricating oil, and explosives.
Her strongest academic field is chemistry, which fits her practical and technical mindset.
After enrolling, Hiromi was delighted to be assigned to the same ship as Mashiro.
However, she was unhappy that Akeno Misaki, rather than Mashiro, had been appointed captain of Harekaze.
At first, she openly showed dissatisfaction and jealousy.
She also developed strong resentment toward Akeno, believing that Akeno let personal feelings interfere with duty.
Because of this, Hiromi was one of the rare Harekaze crew members who did not initially view Akeno favorably.
She could be blunt and harsh, even saying, "Isn't there someone else better suited to be captain?"
Over time, her attitude began to soften.
The crew's teamwork during the battle with Hiei and the rematch with Admiral Graf Spee gradually led her to cooperate more with Akeno, even if she still had reservations.
A major turning point came during the Equator Festival.
When Maron became upset, Hiromi saw how Akeno responded, and this helped change her view of the captain.
Another important moment followed when Hiromi faced Akeno in a sumo match arranged through Maron's scheming and won.
After that, the two reconciled, and Hiromi became much less hostile.
Later, when Harekaze detected Musashi, Hiromi joined Maron in encouraging both Akeno and Mashiro.
By then, she had grown into someone who helped hold the team together rather than divide it.
Maron Yanagiwara
Hiromi and Maron Yanagiwara are hometown childhood friends.
Their bond is close, long-standing, and central to Hiromi's personal life.
Maron describes Hiromi as cool, calm, and kind.
At the same time, Maron is said to become jealous at the thought of "losing Kuro-chan to some girl who suddenly appeared," a reflection of how attached she is to her.
Mashiro Munetani
Hiromi admires Mashiro Munetani deeply.
That admiration was powerful enough to shape her decision to pursue a Blue Mermaid career and attend the same school.
Her early loyalty to Mashiro also explains much of her initial conflict with Akeno.
She believed Mashiro should have been captain and struggled to accept the actual command structure aboard Harekaze.
Akeno Misaki
Hiromi's relationship with Akeno Misaki begins in tension.
She sees Akeno as irresponsible and unfit for command, especially when emotions appear to influence Akeno's decisions.
Still, this view changes through shared hardships, combat experience, and personal interaction.
By the later stages of the story, Hiromi no longer stands apart as a critic and instead becomes one of the people helping Akeno move forward.
Hiromi is an excellent sumo wrestler with a wide range of techniques.
She is not just strong, but a highly skilled technician in the ring, capable of using many moves with finesse.
Her talent is serious enough that she once won a local women's sumo tournament in her hometown.
This makes her one of the more unexpectedly formidable members of the Harekaze crew.
She is also technically gifted in engineering matters.
Her expertise includes machines, engines, fuel, lubricants, and explosives, making her especially well suited to the engineering division.
Her height also makes her stand out visually among her classmates.
Because of this presence, she reportedly received the second-highest number of popularity votes on Harekaze after Machiko Noma.
"Isn't there someone else better suited to be captain?"
This line reflects her early harsh criticism of Akeno Misaki.
"I think it means that true friends make up for what the other lacks. Soya. You're the only one who can support the captain."
This later line shows how much her perspective matures over time.
"Love should be given without holding anything back."
The quote highlights the depth beneath her cool exterior.
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