Malty S. Melromarc (マルティ＝S＝メルロマルク Maruti S Meruromaruku?), is the main antagonist of the series. She is the former first Princess of Melromarc who betrayed Naofumi Iwatani by lying about him sexually assaulting her. After her lies were exposed, she was disowned from the royal family where she soon betrayed the other 3 heroes, and she became a wanted criminal.