Kamuro Masumi

Biodata

Background / History

Kamuro Masumi is a student enrolled in Class 1-A at Tokyo Metropolitan Advanced Nurturing High School 2. She entered the school through the regular entrance exam and interview process, though she harbors an underlying insecurity about her scores 2. Outside of academics, she has a secret history of shoplifting, a weakness discovered by Sakayanagi Arisu, who uses it to coerce her 5 17 28. Later, Suzuki Toru also discovers her shoplifting habits through cold-reading and observation, adding further leverage over her 17 18. Because she is bound to Sakayanagi and later targeted by Suzuki Toru's manipulations, she frequently finds herself caught between their power dynamics and forced to act as an informant or go-between 5 14 27 41.

Despite her initial hostility toward Suzuki Toru, she enters an uneasy arrangement where he tutors her in mathematics to help her prepare for upcoming midterm exams 28 41 42. Over time, her grades improve significantly, shifting from barely passing to scoring over eighty 47 50. She also reluctantly submits to Suzuki Toru's persistent and perverse personal requests in exchange for his academic guidance and protection 42 47.

Appearance

Kamuro Masumi is a tall female student with fair skin, jade-like earlobes, and a slender physique 2 5 12. She often wears her school uniform with a slightly short skirt and is frequently seen wearing black calf-high or knee-high socks 12 17 50.

• Tall stature relative to her peers 2 5.
• Pale skin and visible collarbones 2.
• Regularly wears black calf-high or knee-high socks 17 50.

Personality

Kamuro Masumi presents a cold, confident, and unrefined exterior, often looking at people with disdain or treating them like trash when annoyed 2 5 6. She is fiercely independent and prone to covering up her insecurities—particularly regarding her academic performance—with aggressive or dismissive remarks 2 28. Behind her tough facade, she is surprisingly pliable when trapped by undeniable leverage, eventually resigning herself to Suzuki Toru's teasing and unorthodox tutoring sessions 42 47. She is also socially isolated and lacks close friends within her class, though she exhibits a soft spot for sweets like sundaes 22 47.

Abilities & Skills

Academics

Kamuro Masumi is an average student whose foundational understanding is acceptable, but she struggles with complex problem-solving 42.

• Tends to rely on brute force or exhaustive enumeration when facing difficult problems 42.
• Improved her academic standing from barely passing a 60-point quiz to scoring over 80 under Suzuki Toru's tutoring 47 50.

Surveillance and Subterfuge

• Utilized by Sakayanagi Arisu and Suzuki Toru as a scout or informant to tail targets like Kushida Kikyo 22 41.
• Possesses stealthy shoplifting skills capable of bypassing casual store staff, though susceptible to being caught by observant individuals 17 18.

Equipment / Weapons / Items

• Notebook and Ballpoint Pen — Carried in her bag 2.
• Safety Shorts — Worn as a defensive countermeasure against Suzuki Toru's intrusive requests 40.

Relationships

• Suzuki Toru — Classmate, tormentor, and tutor. Though she initially despises his perverted requests and blackmail regarding her shoplifting, she submits to his tutoring, which successfully raises her grades, and eventually grows numb to his eccentricities 2 18 42 47.
• Sakayanagi Arisu — Classmate and de facto master. Sakayanagi holds leverage over Kamuro due to her shoplifting habit, forcing Kamuro to act as her subordinate and spy 5 14 27 41.
• Horikita Suzune — Target of a financial contract. Kamuro acted as a proxy to sell school information and debt contracts to Horikita on behalf of Class A 24 25 28.
• Shiina Hiyori — Library acquaintance. Kamuro frequently shares study space with her and grows quietly jealous or flustered when Suzuki Toru interacts with her 41 47.

Story Role / Major Arcs

• Introduction and Revelation of Weakness: Introduced in Class 1-A alongside Sakayanagi Arisu, where she quickly learns about the school's harsh expulsion system and gets her shoplifting discovered by both Sakayanagi and Suzuki Toru 2 5 17.
• The Information Brokerage: Acts as Class A's representative to sell school information and sign a debt contract with Class D's Horikita Suzune 24 25 28.
• The Tutoring Arrangement: Tasked by Sakayanagi to act as a mole on Suzuki Toru, she instead ends up receiving intensive math tutoring from him to survive the midterm exams, slowly developing a grudging tolerance for his eccentric behavior 41 42 47.

Notable Quotes

"How else? I obviously passed the entrance exam fair and square, just like you, after going through an interview!" 2

"Disgusting." 5

"Who would want something like that? Boring. I'm going back." 6

"Fine, if you beg me, I'll satisfy you." 40

Trivia

• She is a member of the Art Club, though she joined primarily due to Sakayanagi Arisu's coercion rather than genuine interest 22.
• She has a weakness for sundaes, which Suzuki Toru uses as a bribe to motivate her studies 47.