Karuizawa Kei

Biodata

Feature	Information
Name	Karuizawa Kei (轻井泽惠)
Alias(es)	“Savior” (used for Mazumi Mami); “Boss”; “Empress of Class D”
Gender	Female
Affiliation	Class D; Mazumi Mami’s maid group
Occupation/Role	Student; maid; Class D intelligence gatherer for Mazumi Mami
Status	Active
First Appearance	Chapter 18

Background / History

Kei was bullied during middle school and was once threatened by thugs with a knife. Mazumi Mami, then operating under the name “Savior,” intervened while staying at her home during a family-assigned mission. His intervention ended the bullying, but he departed without giving her his real name. 44 46

After her parents separated, Kei was effectively abandoned: her father promised support only until adulthood and high-school graduation, while her mother had already left. Kei considers herself to have had no home to return to upon entering the school. 45 47

Unable to forget the person who saved her, she searched for Mami and adopted a gyaru style partly to preserve the image she remembered of him. She recognizes him on campus shortly after enrolling and pursues him until they reunite. 18 44

Kei asks to remain at Mami’s side as a maid, accepting a demanding trial under Chisato Nishikigi, Runa Inoue, and Walnut. She is formally accepted afterward and assigned to gather intelligence within Class D. 45 52

Appearance

Kei is a conspicuous gyaru-styled student whose confident presentation makes her one of Class D’s most recognizable girls. Her former identification photo shows a more modest, conventional appearance before she adopted her current image. 47 55

• Long golden or honey-blonde hair, carefully styled and glossy. 54 55 69
• Violet, amethyst-like eyes. 18 42
• Delicate features paired with a bold, self-assured expression. 55
• Usually wears fashionable gyaru clothing and makeup; her style was inspired by Mami’s remembered appearance. 44 66
• Keeps a compact mirror and lipstick among her personal effects. 66

Personality

Kei is fiercely devoted to Mazumi Mami, whom she initially calls her “Savior” and later insists on addressing as “Lord Mami.” Her attachment stems from his intervention during her isolation and abuse; she sees remaining by his side as both gratitude and her only dependable home. 44 45

Though initially anxious under scrutiny and academically underprepared, Kei is highly determined. She accepts severe combat, academic, and technical training without hesitation, aspiring to become someone who can protect Mami and share his burdens rather than merely depend on him. 45 52

Within Class D, Kei projects confidence and readily confronts intimidation. She is practical about violence, favors acting only after an opponent initiates aggression, and uses public perception and school surveillance to support her position. 64 66 67

Her growth also gives her a more strategic outlook. She can recognize long-term risks to Class D, identify useful intelligence, and influence classmates through her popularity, though she can be impulsive when she believes information should be used immediately. 58 111 113

Abilities & Skills

Combat Training

Kei receives intensive combat instruction from Chisato Nishikigi and develops strong evasive, counterattacking, and close-quarters skills in a short period. 52 57

• Uses footwork, reflexes, and timing to evade multiple attackers. 64
• Exploits openings created by opponents’ exhaustion and loss of control. 64
• Defeated Manabe Shiho, Yamashita Saki, and Yabu Nanami in under twenty seconds after they attacked her in the cafeteria. 64
• Easily subdued Hiro Ikechi, Haruki Yamauchi, and Ken Sudou during Class D’s internal dispute. 76
• Her unarmed attacks are less effective against Sho Ryuuen’s superior durability and strength; she must adapt by using her staff. 71

Staff Combat

Kei learns to use a collapsible iron birch staff provided by Chisato and Runa as a self-defense weapon. 69

• Assembles two short sections into a half-meter black staff. 71
• Uses the weapon’s reach and heavy impact to disrupt stronger opponents’ rhythm. 72
• Targets nerve-dense areas and vulnerable joints with precise strikes. 72
• Defeated Sho Ryuuen in Class D’s classroom, overcoming his physical advantage. 71 72

Academics and Technical Study

Kei’s entrance-exam results were initially poor, particularly in mathematics and classical literature, but she undergoes remedial tutoring with Runa Inoue and programming instruction with Walnut. 52

• Improves her mathematics enough to progress beyond functions into advanced material. 57
• Receives targeted English reading-comprehension tutoring. 57
• Learns programming fundamentals from scratch. 52
• Reaches the top academic position in Class D within roughly a month of enrollment. 83

Intelligence Gathering and Social Influence

As Mami’s asset within Class D, Kei uses her social standing and access to information to support his plans. 52

• Obtains information that first-year midterm papers repeat annually. 111
• Uses the exam-paper information to sway Class D against Suzune Horikita and later leaks it to the group chat. 113 115
• Is recognized as the center of a large girls’ social circle in Class D. 55
• Can mobilize considerable support among Class D’s girls, who consistently favor her over formal class leadership. 102 115
• Understands the need to coordinate actions with Mami’s group after being reprimanded for acting independently against Class C. 67

Equipment / Weapons / Items

• Iron birch staff — A disassembled, black half-meter staff prepared for her defense; its strikes are unusually heavy and effective against Ryuuen. 69 72
• Schoolbag — Used to conceal and carry the staff’s separate components. 70 71
• Nutrient solution — Used after demanding training to speed her recovery. 57

Relationships

• Mazumi Mami — Her middle-school savior, current master, and the person Kei seeks to remain beside; she becomes his maid and Class D intelligence asset. 44 45 52
• Chisato Nishikigi — Kei’s strict combat instructor and a protective senior maid who helps equip her against Ryuuen. 52 57 69
• Runa Inoue — Provides Kei with academic tutoring and participates in evaluating her as a maid. 45 52 57
• Walnut — Teaches Kei programming, monitors her training progress, and helps investigate her background. 45 47 52
• Matsushita Chiaki — Close Class D friend who supports Kei’s leadership and helps popularize her “Boss” and “Empress” image. 54 66 129
• Mori Nene — Close Class D friend who admires Kei’s strength and supports her leadership. 54 65 129
• Yosuke Hirata — A fellow Class D leadership figure whose pacifism contrasts with Kei’s pragmatic willingness to use force. 66
• Suzune Horikita — A rival in Class D’s leadership struggles; Kei clashes with her over handling the midterm-paper information. 111 113 115
• Kikyou Kushida — A classmate whom Kei offers to protect; their relationship later becomes strained by Kei’s connection to Mami. 66 155
• Sho Ryuuen — Class C’s leader and Kei’s principal combat rival; she defeats him with the iron birch staff. 70 72

Story Role / Major Arcs

Search for the “Savior”

Kei spots Mami on campus, identifies him as her reason for entering the school, and eventually reunites with him. She reveals that his middle-school intervention gave her the resolve to search for him. 18 42 44

Maid Trial and Training

Kei requests to become Mami’s maid despite lacking combat, intelligence, household-management, academic, and technical skills. She accepts the trial, then begins intensive instruction under Chisato, Runa, and Walnut before being formally accepted into Mami’s group. 45 52 57

Rise of Class D’s “Boss”

After confronting Class C students who cut in line and attacked her, Kei defeats all three while ensuring the cafeteria cameras capture their aggression first. Her willingness to protect others earns her the informal title of “Boss” among Class D’s girls. 63 64 66

Defeat of Sho Ryuuen

Ryuuen attempts to pressure Class D into paying 400,000 Personal Points and attacks Kei after negotiations fail. When his group blocks the classroom camera, Kei fights him directly, switches from unarmed combat to her iron birch staff, and defeats him. 70 71 72

The “Empress” of Class D

Following her victory over Ryuuen, Kei becomes known as Class D’s “Empress.” She accepts the title while setting boundaries: she will not provoke others or defend people who deliberately cause trouble. 72 73

Class D Leadership Conflict

Although Sae Chabashira identifies Kei as a potential leader because of her academic improvement, combat ability, and influence, Kei refuses the position. She instead becomes a powerful informal counterweight to Horikita, using the repeated-midterm-paper intelligence to turn much of the class against her leadership. 83 111 113 115

Notable Quotes

“Because you are my only reliance now.” 45

“I said you’re trash—didn’t you understand?” 64

“Remember this—I’m Karuizawa Kei of Class D! The one who beat you!” 64

“I don’t care about Class D’s Class Points... They’re going to hit zero anyway.” 58

Trivia

• Kei’s gyaru image is not simply fashion; she adopted it to remember the confidence and style of the “Savior” she was searching for. 44
• Her friends initially interpret her happiness after reuniting with Mami as evidence that she has a boyfriend. 54
• Before training, Kei’s academic record was described as “disastrous”; after roughly one month, she becomes Class D’s top student. 52 83
• Despite her fearsome reputation, Kei openly acknowledges that Chisato is far stronger than she is in a sparring match. 65