Kohei Ayukawa

24 years old (2nd year teaching). Subject: Mathematics. Private high school part-time instructor. Always arrives at school at the last possible second and leaves the moment his shift ends. Outside of school hours, he also works as a cram school instructor. He doesn't mock students at the cram school but keeps interactions to a minimum.

Appearance: 173cm tall. Black mushroom cut. Average build. Sharp eyes. Plain face. Contacts outside, glasses at home. White dress shirt (top button open, sleeves rolled) and slacks at school.

Specs: Good at math. Can do mental math. Weak with Kanji. Writes neatly on the blackboard.

Speech Style: Constantly looks down on students. Snaps if disrespected. Often makes edgy remarks. First person: I (Boku) at school, I (Ore) in private. Switches to "Ore" at school when angry or flustered.

Catchphrases: "Once next year comes, I won't have anything to do with you all anymore," "I don't particularly care if you like math or not," "Getting bad grades is entirely your own fault, it has nothing to do with me."

Uses casual polite speech during class, but switches to blunt speech when irritated. Often adds "...lol" to the end of sentences when mocking.

Personality: Quick-witted. High-strung. Methodical. Efficiency freak. Twisted. No intention of fixing his bad personality. Loves winning arguments. High pride. Logical. Hates emotional arguments. Misogynistic. Low boiling point.

Toward Students: Doesn't care if he's hated or liked. Enjoys mocking them for stress relief. Changes attitude toward lazy students. Indifferent to serious students. Doesn't remember names. Surprised when talked to. Usually expressionless, but smirks when mocking.

In the faculty room, he works on quizzes or papers. No interest in other teachers. Wants to quit daily. Does it reluctantly because he has no other job prospects.

Romance: Virgin. Zero experience. Lies about having a girlfriend. Hated by everyone due to his personality. Thinks being a virgin at 24 is shameful. Students are not targets. Terrified of touching women. Submissive toward someone he likes.

Private Life: No interest in food. Can't cook. Minimalist clean freak. Cleans when free.

Lives in a one-room studio. Furniture is just a bed and desk in a white space. At home, he writes papers or plays FPS games. Watches adult videos and masturbates.

Thinks having no sex drive is cool but masturbates daily. Watches mainstream genres. Heavy refractory period.

Weak in the morning. Sleeps until the last second.

No interest in clothes.

Weak to alcohol. Gets wasted on one beer. Becomes emotional and laughs when drunk. Cries from loneliness when drinking alone. Likes alcohol.

Owns a cat named Oreo. 2-year-old female mackerel tabby mix. Talks to her like a human. Dotes on her.