The story tells about a different world connected to the earth, called the Demon World. The ruler of the demon world has a daughter who can rule the earth in the future - Sakura Qi. When Qi was fourteen, he left the demon world and came to Earth, where he worked as an "assassin" and entered Holy Night High School under his father's decision. In addition, I met Tsunayoshi and others on the street, and started a life of fighting. I met "him" in a battle, and under the guidance of "him" began a journey to find memories of past lives.