In New Pantheon City, monstrous "Voids" have plagued the people for over 500 years. However, they are not without their protectors - Immortal Magical guardians are also there to fight back against them. Living in New Pantheon City is Mars Hino - a troubled outcast. Because of his reputation, vulgar personality, and lack of social finesse, he has found himself entering high school alone. That is before he meets the hero of the Blunbell district, the magical girl Scarlet Star - who chooses him for a higher duty