The homeroom teacher went on maternity leave, and Yuri Sasahara, a deputy homeroom teacher who had been anxious for a long time, became the homeroom teacher. "I" was full of teachers, and I couldn't study, and my grades dropped. Yuri-sensei, who was worried about that, decided to give a special supplementary lesson in the teacher's room, but Yuri-sensei was surprised when she was alone.
