Alma Tandouji lives a lonely and solitary life in a port city within the Kantou region. One day, he is approached by Aiba Rur. She asks for his help and the power of the Sacred Seven which resides within him.

However, Alma turns her away. In the past, Alma had hurt people with that power. Since that moment, he had foresworn it. But when the peaceful city is attacked by a monster, Alma reluctantly decides to use the Sacred Seven.

However, his powers go berserk. Can Ruri help him control his power and reach his true form?