Mayumi

Biodata

Feature	Value
Name	Mayumi Saegusa (真由美) 2
Alias(es)	“Fairy Sniper” 34
Species/Race	Human; magician
Gender	Female
Affiliation	Saegusa Family; First High School Student Council 2 493
Occupation/Role	First High School student council president; competitive magician 2 34
Status	Active 621
First Appearance	Chapter 2

Background

Mayumi first meets Yotsuba Mahiro as First High School’s student council president. His Yotsuba surname visibly shocks her, since the family is feared and mysterious even among the Ten Master Clans; rather than distancing herself, she becomes increasingly curious about him. 2

During the dispute between Course 1 and Course 2 students, Mayumi takes the stage against five representatives of the Alliance of Volunteers and reduces the discussion to a one-sided lecture through her direct, open argumentation. 15

Her father, Saegusa Koichi, later urges her to marry Mahiro rather than Goze Hirofumi after reviewing footage of Mahiro’s combat ability. Mayumi is embarrassed and conflicted by the proposal, while her younger sisters Kasumi and Izumi immediately express interest in him. 22

For the Nine Schools Competition, Mayumi recruits Mahiro’s support as a magic-engineering technician. She entrusts him with tuning her Speed Shooting CAD and later receives his help optimizing her magic for Monolith Code. 27 34 36

When Goze Mio challenges Mahiro over his suitability as Mayumi’s partner, Mayumi openly worries for his safety. Mahiro’s victory forces the Goze Family to stop interfering, after which Mayumi becomes more candid about her feelings for him. 54 55

Mayumi later accompanies Mahiro on the South Shield Island operation to rescue Watatsumi Kokoa, an experimentally created child, and subsequently rescues children and Ms. Morinaga from the Imperial Assassination Corps. 143 146

As Mahiro’s influence over the Yotsuba Family and Japan’s magic community grows, Mayumi publicly supports the Yotsuba Family’s decision to unify the Ten Master Clans. 493 She eventually asks Mahiro to take her along on his travels between worlds. 619

Appearance

Mayumi is a petite, exceptionally shapely young woman standing 155 centimeters tall, with abundant wavy black hair and large expressive eyes. Her appearance combines a refined elegance with an approachable, youthful charm. 2 115

• Wears her long wavy hair loose; her hair is a defining feature of her appearance. 34 115
• Her Speed Shooting uniform includes protective ear guards, transparent goggles, a cinched stand-collar top, and elastic long pants. 34
• Uses an elegant, composed posture while casting Bala, contributing to her “Fairy Sniper” image. 34

Personality

Mayumi is gentle and soothing in ordinary conversation, but highly observant; Mahiro’s guarded reaction to her first approach only makes her more curious about him. 2

As student council president, she is decisive and forthright. She can calmly seize control of a hostile debate and argue multiple opponents into silence. 15

Around Mahiro, Mayumi often displays a mischievous “little-devil” side, teasing him while becoming flustered by his blunt remarks. 34 57 Her affection is complicated by discomfort with magician society’s treatment of relationships and bloodlines, as well as Mahiro’s attention toward other women. 57

Despite those insecurities, she chooses to accept Mahiro and the circumstances surrounding him. Her concern for his safety remains a consistent motive, including when he faces powerful opponents or risks conflict with Japan’s magical establishment. 54 357 492

Abilities & Skills

Bala / Meteor Stream

Mayumi is a solo user of the Saegusa Family’s secret composite magic, Bala, also called Meteor Stream. The spell slows air molecules to create dry ice, accelerates it to subsonic speed, and combines this with Multiple Observation to snipe targets. 16

• Can cast Bala alone, despite it normally requiring two magicians working together. 16
• Uses Multiple Observation to track and strike numerous targets. 16
• Her tuned CAD allows faster activation of both Multiple Observation and Meteor Stream. 34
• Cleared all 100 Speed Shooting targets while her opponent had only destroyed 20. 34

Monolith Code

Mahiro helps Mayumi optimize her magic before the Monolith Code preliminaries, leading to her victory. 36

• Rejects Mahiro’s suggestion that she copy the Jumonji Family’s ancestral barrier magic, Phalanx. 36
• Competes as part of First High School’s Nine Schools Competition team. 34 36

Student Leadership and Debate

Mayumi maintains order within First High and serves as its leading student representative. 2 15

• Led the Course 1–Course 2 discussion after the school unrest. 15
• Defeated five opposing representatives through argument rather than force. 15
• Coordinated the recruitment of magic-engineering technicians for the Nine Schools Competition. 27

Equipment / Weapons / Items

• Personal CAD — entrusted to Mahiro at one point; a magician’s CAD contains sensitive information about the owner’s casting habits. 619
• Rifle-type CAD — designated for her Speed Shooting event and tuned by Mahiro to improve Bala’s activation sequences. 34
• Wrist-mounted CAD — kept concealed beneath her sleeve during the confrontation with USNA personnel. 625

Relationships

• Yotsuba Mahiro — Initially her underclassman and subject of curiosity; later her romantic partner. Mayumi worries for him during his duel with Goze Mio, supports his political ambitions, and asks to accompany him between worlds. 2 54 493 619
• Saegusa Koichi — Her father and head of the Saegusa Family. He presses Mayumi to pursue Mahiro in order to secure Mahiro’s exceptional bloodline for the family. 22 56
• Kasumi Saegusa — Her younger sister. Kasumi openly develops an interest in Mahiro, creating tension around Mayumi’s own feelings. 22 53
• Izumi Saegusa — Her younger sister. Izumi admires Mahiro’s power and considers him the strongest magician she has seen. 22 56
• Goze Hirofumi — Her former intended fiancé, whom Mayumi does not wish to marry. 22 53
• Goze Mio — Hirofumi’s older sister, who challenges Mahiro to a duel over Mayumi’s relationship with him. 53 54 55
• Mari Watanabe — Her close friend and fellow First High official, who works with her on school and competition matters. 15 28
• Miyuki Shiba — Mahiro’s cousin and one of the rivals Mayumi recognizes in her relationship with him. 491

Story Role / Major Arcs

• First High School Arc — Introduces herself to Mahiro, investigates his Yotsuba identity, and resolves the Course 1–Course 2 conflict as student council president. 2 15
• Nine Schools Competition Arc — Recruits Mahiro as a technician, wins Speed Shooting, and advances through Monolith Code with his assistance. 27 34 36
• Saegusa–Goze Marriage Conflict — Faces pressure to marry Goze Hirofumi before Mahiro defeats Goze Mio and ends the Goze Family’s interference. 22 54 55
• South Shield Island Rescue — Joins Mahiro in rescuing Watatsumi Kokoa from human experimentation. 143
• Arcadia Period — Accepts Mahiro’s expanding household and remains involved with his affairs on Mashima Island. 346 357
• Ten Master Clans Meeting — Publicly backs the Yotsuba Family’s plan to unify Japan’s Ten Master Clans. 493
• World Travel Period — Requests to accompany Mahiro on his journeys between worlds and attends high-level magician society events with him. 619 621

Notable Quotes

“On this matter, I support the Yotsuba Family’s decision.” 493

Trivia

• Her “Fairy Sniper” title comes from her elegant use of Bala during Speed Shooting. 34
• Mayumi’s family owns a private beach in the Ogasawara Islands. 57
• Lending her CAD to Mahiro is a major sign of trust, since a CAD records a magician’s casting habits and can expose critical weaknesses. 619