Sana Matsushita, in her second year as a teacher. She took on the role of homeroom teacher for the first time and was busy preparing lessons every day until late. As usual, Sana was making materials in the sparsely populated library when the janitor Sugura approached her with interest. Unable to hide her wariness of Sugura, who wasn't known for his good reputation. However, Sugura appeared in the library again, targeting Sana…
