Miku, an honor student who attends a preparatory school in Tokyo, is a quiet and serious student. However, Miku had her own worries. That is, she is being followed by Kashiwagi, a delinquent student and the son of the director of the school she attends. ``Kashiwagi'' has a psychopathic side and it is difficult to know what he is thinking, so ``Miku'' spends her days treating him like she is running away even though she is scared.