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.
Yes, which is why you need to figure it out soon,
Ja, deshalb musst du es
ja schnell lernen, …
Es cierto, y es por eso que 
debes averiguarlo pronto...
Es cierto. Y por eso deberías 
descubrirlo pronto...
Oui.
Già, per questo devi capirlo al volo,
Por isso você precisa 
descobrir logo como funciona,