Kuro no Rondo

Eli and Julia attend a school where students are divided into two dorms based on family background—dorm 1 for wealthy students and dorm 6 for those from ordinary families. Eli is assigned to dorm 6, while Julia goes to dorm 1. Some dorm 6 students believe Eli is a prophesied dark queen of their cult, citing a dark star mark and her apparent ability to harm those she dislikes. Separately, a girl seeks out her younger brother after their parents' divorce by posing as his new tutor.