Mr. Heianzan

Mr. Heianzan serves as the homeroom teacher for the class that Reina Aharen and Shōta Raidō join when they advance to their third year.

She is in charge of English and approaches her work with the enthusiasm of a freshly appointed teacher.

Before arriving at the school seen in the story, she already had a senior–junior relationship with Ms. Tōbaru at a previous workplace.

The exact details of their shared past are not explained and remain unknown to the audience.

Mr. Heianzan is characterized by high emotional volatility and dramatic reactions.

When things do not go as she expects, her mood can swing rapidly from confidence to despair.

She has a strong passion for teaching and sincerely wants to guide her students properly.

Because of this, she takes her role very seriously and is easily shaken when she feels she is not living up to her own ideals.

A notable physical trait is her prominent snaggletooth, which gives her expressions a slightly comical and memorable look.

This feature often emphasizes her reactions, whether she is fired up with enthusiasm or crushed by self-doubt.

Mr. Heianzan is especially wary of Reina Aharen and Shōta Raidō.

Ms. Tōbaru has warned her that they are “persons of concern” who possess a strange, hard‑to‑grasp charm or atmosphere.

Because of this prior warning, she initially approaches Reina and Raidō with a mix of caution and tension.

Their unusual behavior and unreadable distance from others leave her constantly unsure of how to handle them.

When the students act in ways that fall outside her expectations, she quickly becomes confused.

Her attempts to maintain authority and control are frequently shaken by the class’s odd dynamics.

Whenever Mr. Heianzan is troubled by her students’ actions, she reflexively pulls out the national curriculum guidelines.

She then desperately searches for an officially prescribed solution, trying to respond “by the book.”

If she cannot find any guidance in the curriculum or realizes the situation is beyond what the manual covers, she immediately becomes discouraged.

At such moments, she labels herself a “failed teacher” and sinks into visible disappointment.

Despite these overreactions, her efforts show that she genuinely wants to do things correctly and responsibly.

Her reliance on official documents highlights both her inexperience and her desire not to make careless mistakes.

Relationship with Ms. Tōbaru

Mr. Heianzan and Ms. Tōbaru knew each other before their current school, with Ms. Tōbaru in the position of senior and Heianzan as junior.

This senior–junior dynamic continues to color their interactions, with Heianzan often influenced by Tōbaru’s opinions.

It is Ms. Tōbaru who first tells Heianzan to be careful about Reina Aharen and Shōta Raidō.

Following this advice, Heianzan enters the class already biased and on guard, which affects how she views their every move.

Although their exact history is not revealed, the trust Heianzan places in Ms. Tōbaru’s judgment is clear.

This trust is strong enough that a single warning shapes Heianzan’s entire initial approach to her students.

Relationship with Students

To the students, Mr. Heianzan comes across as earnest but somewhat easy to unsettle.

Her habit of panicking, flipping through the curriculum, and then sinking into self-criticism makes her reactions entertaining and endearing.

While she tries to maintain a professional distance, the unusual presence of Reina Aharen and Shōta Raidō constantly throws her off balance.

Her struggle to understand them becomes a recurring source of humor and character growth.