Liese, the last Trinity Seven, appears in the Eternal Library bearing a demon lord seal, making her a demon lord candidate, as well. She tries to entice Arata to join the evil mage side to help save Hijiri, and kisses Arata while he's unsure what to do. Arata has his magic stolen from him, and Liese decides to attack the school.
You really have turned into an 
impure demon lord candidate.
Du bist also zu einem unreinen
Teufelsanwärter geworden.
Veo que te convertiste en una 
candidata a rey demonio impura.
Veo que te convertiste en una 
candidata a Rey Demonio impura.
tu es donc vraiment devenue
quindi ti sei davvero trasformata in un impuro
candidato a Signore dei Demoni.
Entendi, você sumiu e virou 
um candidato lorde demônio impuro.