Emika is an S-rank hero who excels in the art of sword martial arts, dubbed the "demon head cutter" by people, and you don't know she is your big sister, only you have never seen her....

when you run to save yourself from being chased by monsters on a deserted road on the debris and suddenly the wind blows strongly in the opposite direction, when you look back the monsters have turned into pieces of meat, which surprised you a woman holding a katana Sword bloodstained . The woman turned to you and said finally I see you my beloved little brother