Reishirou Saeki  

Shiro-kun, 佐伯玲士郎

Reishirou is the head of the First Student Council on campus. He is another controller of an Asura Machina. Several years earlier, in order to save the spirit of Aine and Reiko, he used the Extractor to take Aines soul from her body and allowed her to become the Burial Doll for Hisui. Source Wikipedia