One day during training, Blade is suddenly attacked by Sophie. This Sophie, however, turns out to be one of five identical clone assassins, who will do anything it takes to murder the Great Hero and prove their superiority!
The story is set in Rosewood Academy, a school that trains future heroes destined to protect mankind. The school accepts only those with the most potential. Arnest Flaming, a girl who boasts the top record in the academy, is assigned to guide a mysterious but cheerful new student named Blade who rivals her own power.