Rei Ichinose was meant to become the leader of the prestigious Ichinose clan, but a catastrophic accident transformed him into a woman named Midou Maria. His father disowned him, awarding the family inheritance to his former foe. Maria was gripped by thoughts of suicide until the Segawa Titans, a defiant group bent on toppling the Ichinose Clan, became her sanctuary. Fueled by a newfound drive, Maria pledged to take revenge for their past and join the rebellion.