Сіна Канон

A student who belongs to the Student Council just like the other characters. She, along with Kiriya, are later transported to End Earth shortly after Kureha and Souma. Upon their arrival, Seena and Kiriya form an independent mercenary group called the Luminous Knights; with Seena as the leader. She lets Kiriya use her heart as a sword only to allow him to fight, the Gun Sword Blade Cannon. (Source: Wikipedia)