Yamauchi

Biodata

Feature	Details
Name	Yamauchi Haruki (山内 春樹)
Alias(es)	“Horse Face”
Gender	Male
Affiliation	Class 1-D, Advanced Nurturing High School
Occupation/Role	Student
Status	Active
First Appearance	Chapter 1

Appearance

Yamauchi is described as horse-faced, with messy hair. 1

• Frequently brushes or adjusts his bangs while trying to look impressive. 1 11
• His appearance and behavior make him a recurring target of ridicule among classmates. 49

Personality

Yamauchi is boastful, impulsive, and highly concerned with appearing impressive—especially to girls. He exaggerates his achievements during Class D’s self-introductions, claims he was a baseball ace, and insists he would be the best arm wrestler if not for an injury. 11

He has little awareness of social boundaries. He mocks the stage-frightened Inokashira during her introduction, casually calls Chabashira an “old hag,” and openly spends all of his points expecting the next monthly allowance. 11 54 His claims often collapse immediately under scrutiny, most notably when his “all correct” math test turns out to be worth only 26 points. 49

His attitude toward Uchiha is inconsistent. Yamauchi initially calls him “Master” and seeks his pickup advice, later blames him for getting injured, attempts to sabotage his Student Council recruitment out of jealousy, and ultimately interprets Uchiha’s academic feat as an elaborate hidden plan. 4 7 20 50

Abilities & Skills

Physical Ability

Yamauchi presents himself as physically formidable, but his documented performances do not support his boasts.

• Challenges Uchiha to an arm-wrestling match and is decisively defeated one-handed despite exerting himself fully. 7 8
• Attempts to avoid the one-kilometer physical-fitness test with a fake injury; Dongshan forces him to participate, and he slips during the race. 36
• Claims an old arm injury prevents him from demonstrating his supposed arm-wrestling ability. 11

Academics

Yamauchi performs poorly in mathematics despite claiming otherwise.

• Celebrates each answer during a test review as though he had answered everything correctly. 49
• His test paper is exposed as scoring 26 points. 49

Relationships

• Uchiha Jiahao — Classmate, self-styled disciple, rival, and eventual admirer. Yamauchi seeks Uchiha’s pickup advice, blames him for his resulting injury, loses an arm-wrestling match to him, and unsuccessfully tries to block his Student Council appointment. 4 7 8 20
• Chabashira Sae — Homeroom teacher. Yamauchi addresses her disrespectfully and calls her an “old hag,” worsening the already tense atmosphere in Class D. 54
• Inokashira Kokoro — Classmate whom Yamauchi mocks when she struggles through her self-introduction. 11
• Kanji Ike — Classmate and fellow spender. The two discuss using their monthly points for a game console and a gift for Kushida. 12 54
• Kushida Kikyo — Yamauchi hopes to impress girls such as Kushida, though he repeatedly misreads social situations. 5 54

Story Role / Major Arcs

First-Day Antics

Yamauchi first notices Uchiha’s rain-soaked appearance and assumes it is a calculated way to attract kind female students. 1 He quickly becomes fascinated by Uchiha, addressing him as “Master” while asking for flirting advice. 4 5

Following Uchiha’s deliberately absurd suggestion to claim he is gay when approaching girls, Yamauchi approaches a white-haired girl and is injured around the eyes. He then confronts Uchiha and blames him for the outcome. 5 7

Arm-Wrestling Defeat

Seeking to humiliate Uchiha and make him buy milk tea, Yamauchi challenges him to arm wrestle. 7 The wager escalates into an apparent class-wide milk-tea promise, and Yamauchi is defeated effortlessly while Uchiha checks stock prices with his other hand. 8

Class D Disruptions

During the self-introductions, Yamauchi boasts about implausible athletic accomplishments and claims classmates should learn from him. 11 He later reacts poorly to the school’s point system, plans to spend his allowance on a PS5 Pro, and spends all of his points before discovering Class D will receive none for the month. 12 54

Student Council Jealousy

When Horikita Manabu recruits Uchiha, Yamauchi attempts to prevent the appointment by accusing Uchiha of violently sending him flying after their arm-wrestling match. 20 His accusation fails, and Horikita confirms that Uchiha will join the Student Council. 20

Academic Humiliation

Yamauchi claims that he answered an entire math test correctly, only for his 26-point score to be revealed publicly. 49 He is then stunned when Uchiha, whom he believed had merely been sleeping through class, flawlessly solves a difficult proof problem. 49 50

Rumor-Spreading

Yamauchi is identified as a source of rumors that Uchiha entered the academy through improper connections and joined the Student Council without assessment. 34

Notable Quotes

“My name is Yamauchi Haruki. You'd better remember it, because it'll become the nightmare you can never escape for the rest of your life.” 7

“I bet he loses by five laps.” 42

“Nice!! Right, all right!!!” 49