Moko, who attends a school in Tokyo, was spending happy days with her best friend Hikaru. Their daily routine involved stopping by a convenience store after school to eat snacks and chat. One day, Moko found out that Hikaru was shoplifting. Driven by a sense of justice, she confronted Hikaru, who admitted it was an impulsive act due to exam stress and promised not to do it again. However, the next day, Hikaru was caught shoplifting by the convenience store manager but framed Moko by putting the stolen items in her bag.
