Yasui Makoto

Biodata

Feature	Details
Name	Yasui Makoto (安井真)
Alias(es)	A-Makoto; Ma-kun 435 437
Species/Race	Human 419
Gender	Male
Affiliation	Central Treisen Academy; Student Council member 8 385
Occupation/Role	Trainer; former Extreme Stuntman in his past life 178
Status	Active
Age	18 at the beginning of the story 1
First Appearance	Chapter 1

Background / History

Makoto recalls a past life spent pursuing speed and physical limits as an “Extreme Stuntman.” That pursuit ended in an aircraft crash, a regret that later allows him to understand Alice Speed’s fixation on surpassing limits. 178

He grew up around racing through his father, Yasui Koichi, a Trainer who worked primarily in Nagoya and Kasamatsu for roughly two decades before moving into a local racing-association administrative role. Makoto accompanied him to training grounds and race venues from childhood, while also training extensively in running, swimming, and other sports. 634 635

At 18, Makoto is knocked ten meters away by Hokubu Genkoma’s uncontrolled high-speed run, but suffers only minor injuries. The incident brings him into contact with Genkoma and Dr. Alice Speed, who immediately takes an interest in his unusually resilient body. 1

Appearance

Makoto is a young man with neat short hair, defined features, bright eyes, and a tall, upright build shaped by long-term athletic training. Despite his youthful appearance, his expression and demeanor often carry a composure beyond his age. 308

• Lean, robust physique with notable agility and physical conditioning. 308 476
• Usually carries practical training tools, including a messenger bag, tablet, stopwatch, and notebooks. 8 186
• Maintains a focused, furrowed-brow expression when absorbed in analysis or planning. 637

Personality

Makoto approaches training through measurable conditions, data, and individualized planning rather than conventional appeals to spirit or sentiment. He is cautious with unfamiliar people—especially Alice Speed—but changes his plans when evidence or expertise gives him a good reason to do so. 24 262

Though he considers himself poor at comforting others, he is attentive to what his trainees need. After Hokubu Genkoma finishes last in a Training Race, he redirects her attention from defeat toward concrete improvements and future goals instead of offering empty reassurance. 89

He is rigorous about safety and professional boundaries. Makoto refuses to make irresponsible assessments of prospective Uma Musume, avoids deciding personal matters for his trainees, and prioritizes recovery when they have exceeded their limits. 198 556 627

His dedication can become self-destructive. He repeatedly works through injury, jet lag, and exhaustion, eventually collapsing after prolonged pursuit training with Alice Speed. 276 324 500

Abilities & Skills

Training Analysis and Race Planning

Makoto specializes in identifying the physical and tactical factors limiting an Uma Musume’s performance, then designing targeted training to address them.

• Tracks split times, recovery, and physical condition during training runs. 8 91
• Uses biomechanical indicators such as heart rate, lactate threshold, muscle condition, reaction time, and body-fat percentage when evaluating Hokubu Genkoma. 178
• Recognized that Genkoma’s low heart rate and insufficient energy supply were restricting her top speed; he arranged near-limit training intended to improve her cardiovascular function without causing injury. 178
• Builds race plans around track conditions, opponents, distance, pacing, and each runner’s strengths rather than relying on fixed doctrine. 262 379 490
• Upgraded his drone equipment with thermal imaging to monitor fatigue curves during camp training. 153

Mentorship

Makoto tailors his guidance to the individual rather than simply imposing his conclusions.

• Encourages trainees to make their own choices in personal matters, believing self-directed decisions are necessary for lasting growth. 198
• Agrees to mentor Anmokume when she directly asks for his guidance. 100
• Learns to involve Hokubu Genkoma more directly in future race planning and values her input. 467
• Supports Hokubu Genkoma’s attempt to learn administrative work while keeping her racing and health as priorities. 628 631
• Envisions a team model in which he manages data and broad tactics while Genkoma translates his ideas into guidance Uma Musume can more directly understand. 654

Extreme Stuntmanship

Makoto possesses exceptional parkour-like mobility, obstacle-clearing technique, coordination, and spatial judgment developed through extreme sports.

• Won the opening round of an Uma Musume Chase Battle against Aunise Fuujin by using fitness equipment and the environment to evade her. 419 420
• Can vault obstacles, climb equipment, make long jumps, change direction quickly, and slip through narrow spaces that delay faster pursuers. 420 436
• Designed obstacle-based chase simulations to teach Anmokume and Hokubu Genkoma that adaptability and cornering matter as much as raw speed. 435 436
• Cannot match a G1-class Uma Musume in a conventional straight race; his advantage comes from obstacle navigation and strategy rather than pure running speed. 153 435

Physical Resilience

Makoto’s conditioning is unusually high for a human, though it does not make him immune to injury or fatigue.

• Endured being knocked ten meters by Hokubu Genkoma with only minor injuries. 1
• Sustained a hairline fracture in his left arm after an accident during a post-race celebration and required four to six weeks of treatment and rehabilitation. 253
• Fainted from jet lag and overwork during the Dubai trip. 324
• Collapsed after a lengthy pursuit-training session with Alice Speed. 500

Languages and Music

• Speaks fluent English when introducing himself to California Shine. 308
• Received credited-artist status and a share of royalties connected to the release of Uchiage Hanabi, though he does not intend to pursue music professionally. 72
• Uses Hokubu Genkoma’s musical sensitivity and familiarity with rhythm as part of his approach to improving her foreign-language learning. 619

Equipment / Weapons / Items

• Tablet and stopwatch — Used to record split times, venue data, and training observations. 8
• Training notebook — Contains his analysis, planning notes, and observations. 52
• Thermal-imaging drone — Used to monitor fatigue curves during training camp. 153
• Hokubu Genkoma’s training logs — Detailed records he conditionally shared with Alice Speed for personal research. 178 186
• Pocket watch — A valuable gift from Hokubu Genkoma that synchronizes with her stride frequency and rhythm. 357
• Ono Trading business card — Given by Kitajima Saburo as an offer of future assistance with training-related problems. 40

Relationships

• Hokubu Genkoma — His first contracted Uma Musume and primary trainee. Makoto understands her habits, ambitions, and emotional resilience in unusual detail; he eventually acknowledges that he would not reject her feelings, while remaining determined to protect her racing dreams and their professional responsibilities. 270 597 598
• Anmokume — Contracted partner and younger trainee. Makoto agrees to mentor her, recognizes her competitive nature, and develops specialized training around her strengths and weaknesses. 100 367 437
• Alice Speed — Neurology specialist, researcher, and frequent training collaborator. Makoto is initially wary of her experimental reputation, but later shares Genkoma’s training records after setting strict conditions for their use. 1 24 178
• Tokai Teio — Student Council president, advisor, and supporter of Makoto’s work. She provides race materials, mediates his dealings with Alice, and pushes him to confront his feelings for Genkoma. 24 91 597
• Mejiro McQueen — Student Council vice president who recognizes the boldness of Makoto’s race strategies and assists Tokai Teio in supporting Genkoma. 22 595
• Yamato Akagi — Associate and supporter who recognizes Makoto’s patience with his trainees and assists in monitoring his well-being. 491 500
• Yasui Koichi — Makoto’s father, a former Trainer whose reserved concern and career choices lead Makoto to reassess how deeply his father has supported him. 634
• Kikō Misuzu — Makoto’s mother, who openly supports him, proudly shares his childhood accomplishments, and teasingly approves of his closeness with Hokubu Genkoma. 635 640
• Kitajima Saburo — Hokubu Genkoma’s grandfather. He respects Makoto’s vigor and unconventional methods, offering him access to Ono Trading’s assistance. 40

Story Role / Major Arcs

• Beginning as Hokubu Genkoma’s Trainer — Following Genkoma’s accidental collision with him, Makoto begins assessing her immense stamina and physical foundation, using timed runs and individualized training rather than conventional expectations. 1 8
• Early breakthrough — His unconventional, internationally influenced strategy helps Genkoma win her debut race. Within several months, her ability begins to unlock through training and three consecutive victories. 22 89
• Rise as a prominent Trainer — Genkoma earns three G1 victories in her debut year and wins the Arima Kinen during her classic year, establishing Makoto as a widely recognized young Trainer. 308 367
• Expansion of his team — Makoto accepts Anmokume as a contracted partner, prepares her debut, and begins developing a broader training structure around multiple Uma Musume. 100 627
• Overseas ambitions — He prepares plans for international races, including overseas training and the Prix de l’Arc de Triomphe, while navigating the logistical and physical demands of travel. 264 276 324
• Chase Battle and obstacle training — Makoto publicly proves his extreme-sports skill against Uma Musume, then adapts the format into strategic obstacle training for Anmokume and Genkoma. 419 420 435
• Confronting his feelings for Genkoma — Pressed by Tokai Teio, Makoto admits Genkoma’s qualities and states that he has no reason to reject her affection, while emphasizing patience, communication, and his duty as her Trainer. 597 598
• Developing Genkoma as an assistant — As Genkoma begins analyzing races and helping guide Anmokume, Makoto works toward a collaborative model that combines his planning with her ability to communicate directly with other Uma Musume. 651 654

Trivia

• After Alice Speed gives him a recovery potion following his collapse, Makoto develops a faint jellyfish-like glow that even Alice did not expect. 500 501
• His mother keeps several boxes of his childhood trophies, medals, and awards. 635
• He considers himself less naturally talented than the Uma Musume he trains, attributing his own physical ability to sustained training. 441 476