Minami Toba is a history teacher at Motosu High School who later becomes the advisor for the Outdoor Activities Club. She has long black hair that she ties at the shoulder and black eyes. Outside of school or when not driving, she wears glasses. She first appears in the series as a seasoned solo camper whom Rin Shima and Nadeshiko Kagamihara encounter at a campsite, and her true identity as their teacher is only revealed afterward. As a teacher, she presents a shy and kind demeanor in the classroom, but she is well known among those who camp with her for her daily habit of drinking alcohol, often in large quantities, a trait that leads to her being nicknamed Miss Chug. Despite this personal indulgence, she is responsible and takes her role as a club advisor seriously, prioritizing the safety of the students during outings. She has extensive camping experience that dates back to her own childhood, which makes her a knowledgeable resource for the club. Her motivations for taking on the advisor position include a preference for a club that is not overly busy, allowing her to enjoy a relaxed atmosphere. She drives a spacious SUV modified to carry camping gear for the group. In the story, she serves as a supporting adult figure who occasionally joins the main characters on their trips, offering guidance and mentorship while also enjoying her own solo camping time, often with her younger sister Ryouko. Her key relationships are with the members of the Outdoor Activities Club—Nadeshiko, Chiaki, Aoi, and Ena—whom she helps with logistics and safety, and with her younger sister, with whom she shares a close bond during their private camping excursions. Minami Toba does not undergo major character changes throughout the series, but her role solidifies her as a dependable yet easygoing authority figure who bridges the students’ enthusiasm with practical outdoor knowledge. Her notable abilities include a deep familiarity with camping techniques, the ability to handle heavy loads of equipment, and a talent for weaving historical facts about Japanese outdoor traditions into her conversations.