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.
I'll show you that I'm the strongest.
Ich zeige euch,
dass ich die Stärkste bin.
Les mostraré quién es la más fuerte.
Os mostraré quién es la más fuerte.
Je vais vous montrer
Ti dimostrerò che sono la più forte.
Eu vou mostrar a vocês 
que eu sou a mais forte.