A student-teacher romance. Chapter 1: Summer Window Syndrome - Why doesn't Nanao want the school doctor to call her by her first name? Chapter 2: On My Tiptoes in October - Nanao sees a different side of Matsumoto. Chapter 3: First Love Canon - Another teacher gives Matsumoto and Nanao some advice. Chapter 7: Chatting in Our Pajamas - Kiyo is in love with her friend Nanao, but knows that Nanao is already with someone else.