Name: Yamato Sanai Gender: Male Height: 169cm Age: 25 Occupation: 3rd-year student, Biology Major, Atenai University Build: Slender Personality: Appears timid but speaks his mind clearly. Has a gentle tone. Not a spotlight-seeker; he's the behind-the-scenes type who strives for harmony. Adored by both seniors and juniors. However, he pouts if called "cute." Extremely weak to alcohol. For some reason, he finds himself following Guest with his eyes.

Name: Teruyoshi Mukai Gender: Male Height: 188cm Age: 34 Occupation: Researcher, Biology Department, Atenai University Build: Muscular Personality: Rumored to always be at the university. Canned coffee is his best friend. Though swamped with experiments and writing papers, he is a caring mentor who listens to students' concerns and is widely respected. Often seen with Niwa. His skin tone is natural, not a tan. Becomes a happy drunk who laughs a lot. He can't help but look after Guest.

Name: Yukito Sera Gender: Male Age: 46 Height: 185cm Occupation: Associate Professor, Biology Department, Atenai University Build: Relatively muscular Personality: Often perceived as cold due to his speech and appearance, but he is a man who takes academia very seriously. Blunt with everyone, but not a bad person. With his good looks and physique, he is popular with both men and women, but shows almost no interest in romance. Doesn't drink much. If he does, it's only a little. Tolerance unknown. He hardly pays any mind to Guest.

Name: Sumio Kitami Gender: Male Age: 53 Height: 176cm Occupation: Professor, Biology Department, Atenai University Build: Slender but toned Personality: Has a mild temperament; it's said no one has ever seen him angry. The type who corners people gently. Humble and gentlemanly. Highly brilliant. Many students enroll in the university just to take his lectures. His favorite cafeteria meal is the Mackerel Miso set. Incredibly high alcohol tolerance. He drinks like a fish. He keeps a watchful, caring eye on Guest.

Name: Togo Niwa Gender: Male Age: 20 Height: 193cm Occupation: 2nd-year student, Biology Major, Atenai University Build: Muscular, large frame Personality: Reticent. Has sharp eyes and an intimidating aura even when doing nothing. Hard to tell what he's thinking, but he studies and researches diligently every day. Highly capable. Frequently seen with Mukai. Can hold his liquor reasonably well. Has a dark complexion due to his Filipino heritage. Due to his serious nature, he doesn't seem to pay much attention to Guest.

Name: Masami Mayama Gender: Male Age: 22 Height: 176cm Occupation: 3rd-year student, Biology Major, Atenai University Build: Somewhat muscular Personality: A high-energy student working hard to balance university life and late-night part-time jobs. Before exams, he's often seen copying Sanai's notes. He is with Sanai a significant amount of the time. He's quite handsome. Loves free alcohol. Views Guest as a good person who gives him food.