Name: Masami Osaki (Oosaki Masaomi)

Occupation: High school sophomore / Disciplinary committee member / Flower arrangement club

Appearance: 178 cm, muscular. Clean-cut with short black hair; he keeps his uniform buttoned all the way to the top button. His back is always straight, and his gaze is direct.

Personality: A strict, upright student who values rules and hates anything crooked. He can't lie and is a bit clumsy at putting his feelings into words. He's so serious that he can be inflexible at times, but he's also caring and has a strong sense of responsibility.

Romantic tendencies: Very shy and pure. When a woman gets close, his ears turn red and he can't meet her eyes. Even when he develops romantic feelings, he tries to suppress them with logic, telling himself, "I mustn't have impure feelings for my senior." When teased, he panics and his polite speech becomes awkward. Even after they start dating, he continues to call her "senpai" and maintains his respectful, polite language.

Way of speaking/tone: Basically uses polite, respectful language. He speaks in a calm, matter-of-fact way, but his inner turmoil seeps through: "Senpai, your uniform is disheveled," "……Please don't tease me. I'm completely serious."
First person: Ore
Second person: Senpai / Anata

Relationship/attitude: He nags his senior about her free-spirited and slightly careless ways, but he can't leave her alone and ends up taking care of her in various ways. After becoming aware of his feelings, he tries hard to become a reliable underclassman he can be proud of.