Machi Yatsuzuka is the 29-year-old, unmarried homeroom teacher for class 2-T at Yuihime Girls' Academy, where she teaches Japanese. She eagerly hopes to marry as soon as possible. Extremely shy, especially around young men, this anxiety complicates her interactions with male students; she once ducked behind a curtain rather than formally welcome transfer students from Kagamidai Academy. Despite this social anxiety, she adequately fulfills her teaching duties, though she remains reserved near male students. Notably, she enjoys boys' love (BL) content despite her real-life discomfort around men. Physically, she has brown hair, purple eyes, stands 1.60 meters tall, and has body measurements of 79-58-80. Her role expands when she becomes the official adviser for the school's Nuko Club, a position shown during Miu Amaha's storyline in the visual novel and specifically in episode 7 of the anime adaptation. In this role, she assists the club in finding homes for rescued animals, such as placing a female kitten with an acquaintance. Across official media, including the visual novel and anime, she consistently appears as a supporting figure within the school and the Nuko Club.