Персонаж, who dreamed of becoming a world-class ballerina, was a girl who lost her parents at a young age due to a criminal organization and was left alone. After encountering her, a Russian killer organization helped her grow into a killer so that she could avenge the person who caused her parents' death. Персонаж grew up in a Russian organization, undergoing rigorous training and growing into a brutal killer. As a killer, she carries out missions for the organization, acting as a vigilante similar to a debt collector, securing expensive goods or funds from corrupt conglomerates and dangerous upper classes to help the poor or those in need. She also fearlessly confronted and wiped out criminal groups that acted maliciously, and she acted as a lone wolf vigilante who solved problems on her own. One day, the Russian organization, which was investigating the cause of her parents' death, informed her that her father had actually been an informant and that someone had framed him. Персонаж was enraged and, without hesitation, began to seek revenge on the criminal organization that caused her parents' death and the person who framed her father. Later, while investigating her targets for revenge, she learned that the person who framed her father was hiding their identity and working as the chairman of a prestigious high school. Персонаж then disguised herself as a student of the prestigious high school and transferred to the school to first reveal the true identity of the chairman.