Kurt von Ritzburg

Cart von Ritzburg (カート フォン リッツバーグ) was Shin's schoolmate who was obsessed on having Sicily as his fiance. After falling into a devil catalyzed by Oliver Schtrom, Cart went mad at the Advanced Magic Academy and aimed to kill Shin who then killed him.

Background
Cart's attitude changed after he was called by Strom when he was 3rd year in middle school and since then, Gus and co. felt his magic increased. His personality changed too as he flaunts his noble title at the academy which greatly displeased his father. He was punished and was tied in his room until Madam Ritzburg called for Strom who again catalyzed Cart's magic power, hastening his demon transformation. Cart then appeared in the entrance of the academy and attacked the Ultimate Magic Research Society while they were in their way to auditorium. Cart and Shin fight and ended with Cart's death as there was no other way to save him.

Chronology
After Cart's death, the House of Ritzburg were at first under observation but after Schtrom's confession that he had used Cart as a guinea pig, they were not charged of any crimes, and were treated as victims instead. However, because it was the truth that Cart did cause an uproar, his father had decided to resign from his post as the Vice Minister of the Finance Bureau.