As the study camp nears its conclusion, cheeky younger twin Mitoki retreats to the library’s quiet self-study zone, convinced the public atmosphere will temper her tutor Koudai’s demanding lessons. Instead, the silent aisles become the setting for escalating private instruction that tests her composure at every turn. An unexpected encounter with a friend only heightens the tension, pushing Mitoki toward a final challenge that exhausts her defiance and brings the camp’s training to a decisive close.