During a fight between students, Yomogi Sōya suffered a concussion after hitting her head and was taken to the nurse's office. As the school nurse Ayumi tended to her, Sōya regained consciousness... Ayumi started preparing to take Sōya to the hospital as a precaution, but Sōya ignored her and left. Since that day, Sōya has been truant. Concerned, Ayumi and Sōya's homeroom teacher Tsukushi visited her home...
