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.
The reason you're barely able to 
stay conscious is because of that.
Das ist der Grund, warum du kaum
bei Bewusstsein bleiben kannst …
Si no te has desmayado es gracias a eso...
Si no te has desmayado es gracias a eso...
Si tu tiens debout,
c’est grâce à…
Onii-san, il motivo per cui tu stai bene, è quello.
É por isso que você mal 
consegue ficar consciente...