In the future, after everything is destroyed, Japan is ruled by a tyrant who has four sons.
People live in fear and yearn for a hero to build a new world.
But nobody knows the true identity of Tatara. The story begins when Tatara and the prince meet without knowing each other's true identity. Oujima was a member of a delinquent group. At that place, she was attracted to her instructor, Kazusa, However, when she found out that the real purpose of the school is to train assasins for the notorious Toujo Group, she escaped and met the bastard of the Toujo family, Iori.