Chabashira

Biodata

Feature	Details
Name	Chabashira (茶柱)
Alias(es)	Chabashira-sensei; Sae
Gender	Feminine
Affiliation	Advanced Nurturing High School; Class 1-D
Occupation/Role	Class 1-D homeroom teacher
First Appearance	1

Appearance

Chabashira is consistently described through her stern, indifferent demeanor. Her brisk, sharp footsteps and efficient manner of carrying materials reinforce the intimidating impression she gives Class D. 14

• Usually wears an expressionless, grim, or disdainful expression. 14 18 26
• Smokes cigarettes, including during her discussion of Sudo's possible expulsion. 22 23
• Keeps a notably clean and orderly workspace. 24

Personality

Chabashira is blunt, severe, and highly controlled. Rather than comforting Class D after its failures, she treats its poor performance as proof that its students are “trash,” openly mocking them for losing all 1,000 starting class points. 14 She refuses to disclose information beyond what school rules permit and does not soften her answers for students' benefit. 14 24

Despite this detached presentation, she becomes actively involved when Sudo faces expulsion and later monitors the Class C hearing closely. Her interest in Class D's advancement appears unusually intense; she is willing to pressure Hoshino, bargain with him, and entertain severe measures against rival classes. 22 23 42 Her exact motives remain undisclosed.

Abilities & Authority

Class Evaluation Knowledge

Chabashira explains the school's class-point system after Class D's private-point distribution falls to zero. She identifies the system as the S System, which evaluates students in real time. 14

• Announces class rankings and point changes. 14 26
• Explains that one class point corresponds to 100 private points per student. 14
• Informs Class D that exam performance can raise its class points by up to 100. 14
• Reveals that expelling a student deducts 300 class points from that student's class. 42

Access to Student Point Records

As a homeroom teacher, Chabashira can inspect information on students in her class for a limited period, including changes to their private-point balances. 24

• Used this authority to learn that Hoshino possessed enough points to save Sudo. 22 24
• Cannot freely reveal school rules or provide future exam contents, stating that faculty are restricted from disclosing such information. 24

Negotiation and Pressure

Chabashira is willing to make direct, high-stakes arrangements with students when Class D's interests are involved. During Sudo's expulsion crisis, she offers Hoshino one request within her authority in exchange for his payment, then threatens immediate expulsion if he refuses. 23

• Records a video statement of her agreement and later signs a written contract at Hoshino's insistence. 23 24
• Accepts Hoshino's transfer of 300,000 private points to prevent Sudo's expulsion. 23
• Attempts to steer Hoshino toward using his evidence against Class C in a way that would benefit Class D. 42

Background / History

At the beginning of the school year, Chabashira teaches Class 1-D with an impatient, detached attitude. Hoshino finds her lectures dull, and she shows little interest in stopping students from slacking off during class. 1 12

Her approach changes in significance after the first monthly point distribution. She reveals that Class D has lost every class point through absences, tardiness, disruptions, and other violations, then harshly condemns the class instead of offering reassurance. 14 Although she publicly appears unconcerned, Hoshino begins to suspect that her behavior masks a deeper interest in the class's future. 14 24

When Sudo fails his English exam, Chabashira initially orders him to submit a withdrawal form. However, she later arranges for Hoshino to pay 300,000 private points to restore the three points Sudo needs, granting Hoshino a future request within her authority in return. 22 23 In a private follow-up, she confirms her ability to track Class D students' private-point activity but refuses to answer whether she wants Class D promoted. 24

By the Sudo assault hearing, Chabashira is openly attentive to Class D's prospects. She summons Hoshino to discuss his evidence against Class C and reveals the class-point penalty attached to expulsion. Hoshino concludes that she is deeply obsessed with moving Class D upward, even though she still refuses to state her goal outright. 42

Relationships

• Hoshino Hoshiya — Her Class 1-D student. Their interactions are guarded and transactional: she tracks his private points, pressures him into financing Sudo's reprieve, and later discusses using his evidence against Class C. 22 24 42
• Ayanokoji — Chabashira is suspected by Hoshino of favoring him, though she explicitly claims to value Horikita's leadership potential instead. 24
• Horikita Suzune — Chabashira states that Horikita has the aptitude to become a good leader and works alongside her during efforts to preserve Sudo's place in Class D. 22 24
• Sudo Ken — Though initially prepared to expel him for failing English, she facilitates the arrangement that allows him to remain enrolled. She later argues that his athletic ability makes him valuable to the class. 22 23 45
• Hoshinomiya — The Class B homeroom teacher. Hoshinomiya calls her “Sae”; their exchanges carry an undercurrent of hostility, and Chabashira prevents Hoshinomiya from lingering around Hoshino. 24 35
• Sakagami — Class C's homeroom teacher and a participant in the Student Council's deliberation over the Sudo incident. 43

Story Role / Major Arcs

Class Point Reveal

Chabashira exposes Class D's zero class-point total and explains the school’s meritocratic evaluation system. Her ruthless condemnation forces the class to confront the consequences of its behavior. 14

Sudo's Exam Failure

After Sudo fails English by three points, Chabashira first orders his withdrawal, then offers Hoshino a deal: 300,000 private points for Sudo's retention and a future request within her authority. 22 23

Private Agreement with Hoshino

Chabashira records and signs an agreement with Hoshino after he demands proof of their arrangement. She confirms that homeroom teachers can view their students' private-point changes within a certain time period. 23 24

Sudo Incident and Class C Strategy

Chabashira announces the Class C Basketball Club's complaint against Sudo and later meets Hoshino privately before the hearing. She learns he possesses evidence against Class C and discusses the strategic consequences of a rival student's expulsion. 39 42