A story about a senior worker at a part-time job who was not a high school student (1) / Bunnosuke

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I thought she was a junior high school student, but she was actually older? A female college student in Hatachi, Nene Sato, decided to go out for dinner with her senior, Soaya, whom she thought was a high school student. There, she found out that Soaya was four years older than her. She had never imagined that she would be able to do something about it, but the resolution of the other person suddenly increased, and Nene Sato upset.