[Machine Translation] Let's fight together. The brother and sister were tossed around by the fate of the old families in the fabled struggle over the grimoire. The elder brother's name is "Shoya" and the younger sister's name is "Kyuka". Although they had a painful past, having lost their parents when they were young, they lived a small but happy life together. Their days were peaceful and warm. They thought that such a peaceful and warm life would continue forever... but one day, their faint hope was cruelly shattered. [The grimoire is a forbidden existence that has lived behind the scenes of human history for a long time, and has been hidden by mystery. It was never supposed to cross paths with people living a peaceful life. Suddenly, it appeared in front of the siblings, denying them their peaceful life together. They thought they were just an ordinary brother and sister, the kind of people you can find anywhere. They thought they were just an ordinary family. But then they learned. "They are the heirs of a grimoire that has the potential to shake the world" ( CERO Age rating: 15 and up )