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!
That's why when people say 
things are taboo or impure,
Also habe ich eigentlich keine Ahnung,
was mit „Tabu“ oder „unrein“ gemeint ist.
Aunque me hablen de tabúes o cosas impuras,
Aunque me habéis de tabúes o cosas impuras,
C’est pour ça que je ne comprends pas
quand on me parle d’impur ou d’interdit.
Per questo non capisco quando 
dicono che sia impuro o proibito.
eu não entendo o motivo.