7 Genme wa Himitsu
7限目はヒミツ。
A girl who was once quiet and reserved decides to reinvent herself as cheerful and outgoing after her family moves to a new location. She forces smiles and laughter, trying to blend in by constantly agreeing with others. However, she begins to worry that her young teacher might be aware of her facade. She questions whether her concerns are real or simply her own imagination.