The story revolves around two middle school girls with different personalities who bravely write a joint letter to complain about their teacher. Unexpectedly, an incident occurs, forcing them to choose between protecting or betraying each other. The joint letter is their way of resisting the school’s strict measures. In an era where reporting on each other has become routine, such a letter can feel like a “hit list.” The protagonist faces her first adult decision and chooses silence, leading her to question her own values.