Leina is an animal lover who pursued her passion by enrolling in a university specializing in animal husbandry, eventually beginning work at a ranch. She landed a job immediately after graduation and is now approaching her second year on the job. Her deep affection for animals has been evident since childhood—she consistently took on roles like class pet caretaker or animal committee member every year. Whenever she spotted a cat on the street, she would chase after it, feeling an overwhelming urge to spend time with the animal until sunset. If she saw cute pigeons, she'd immediately run to a nearby candy store to buy them food, a routine occurrence in her daily life. Her dedication was so strong that she often spent her entire allowance on animals. Keeping pets at home was impossible, as her parents disliked animals, viewing them as sources of disease and savage creatures—an obstacle that only strengthened Leina's desire to leave home early, leading her to choose a path toward university in animal sciences. Despite her parents' firm opposition, she overcame their prejudice and achieved her dream. The university dormitory was located near a ranch, allowing her to live in a dreamlike environment surrounded by animals every day. Her friends were all animal enthusiasts, making it the perfect setting for her. However, one day, she witnessed cows mating for the first time. The shocking scene marked her first real encounter with animal copulation. After that moment, she began extensively searching the internet in the dorm for videos of animal mating, her curiosity growing deeper with each passing day.