Naoko Yanagi, a middle school teacher who previously instructed Nasa Yuzaki, is perpetually busy with work, allowing scant time for her personal life. She initially considers herself boring, but observing the happiness of Nasa's marriage shifts her perspective, making her more receptive to future relationships. Later, after moving to teach at Otogi High School, an all-girls institution, she specifically recruits Nasa for his expertise to teach a programming class. This decision places Nasa in a new environment surrounded by energetic high school students, forming a central scenario for the High School Days storyline and demonstrating Naoko's continued involvement in his academic trajectory and trust in his capabilities.