第 7 集: Mana與Origami進行練習，而Kurumi則以致命精靈的身份轉入Shido的班級。

Mana is having a 10 vs. 1 practice match against Origami's unit before having introduced herself at the briefing AST's previous battle with Hermit where she unknowingly reveals herself to be Shido's biological sister. Kurumi Tokisaki transfers into Shido's class revealing herself to be a Spirit. During her time touring the school with Shido they're followed by Origami and Tohka, but as Shido attempting to seduce Kurumi she is also attempting to do get closer to him. Kurumi code-named "Nightmare" is known to be the most deadly Spirit. After school, Kurumi kills three delinquents and is confronted by Mana. Mana then runs into Shido later on that day. Taking her to his house, what Mana shares about herself leads to a quarrel between her and Kotori but ultimately leaves everyone with more questions than answers. During school the next day, Shido finds out that Kurumi was killed during her confrontation with Mana yet she appeared at school. Origami questions Kurumi in a secluded place and finds out that Kurumi is pursuing Shido for his extended lifespan. (Source: Wikipedia)

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