World Break: Aria of Curse for a Holy Swordsman

Moroha Haimura attends Akane Private Academy, a school that trains students with ancestral memories to fight Metaphysicals, supernatural beings that attack without warning. Students are divided into two groups: kurogane, who can summon weapons using prana, and kuroma, who can use magic. Moroha's past lives are revealed through encounters with two girls: Satsuki Ranjou, who claims to be his sister from a past life as a heroic prince, and Shizuno Urushibara, who knew him as a dark lord in another past life. The series explores the complexities of students with memories of previous lives.