The girls are running in their exercise outfits, with the boobs swaying to and fro. Arata's heart races. Everyone's having great time, and then a ghost appears in the library. Arata and the gang go to check it out, and are forcefully transported to the "Eternal Library". There they find the lost Trinity Seven!
There was a demon lord element 
sealed in the Eternal Library.
Ein Teufelsfaktor ist in der
ewigen Bibliothek weggesperrt.
La Biblioteca Eterna tenía 
un elemento de rey demonio.
La Biblioteca Eterna tenía 
un elemento de Rey Demonio.
La bibliothèque éternelle renferme
la quintessence du maître magicien.
C'era un elemento del Signore dei Demoni 
sigillato nella Libreria Eterna!
Tem um lorde demônio 
selado na Biblioteca Eterna.