A "d" girl named xena arrives at school brynhildr after spending most of her life being mistreated. initially, the mafia exploited her abilities to create gems until yuu saved her. later, she was revered as a divine figure by a cult that worshipped dragons and believed she was one herself. her weapon is imagined in the form of a dragon.
After she starts to believe that shes a human, her imaginary weapon takes the form of electrified rainbow wings.