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!
This is all because your bouncing boobs
Das ist alles nur, weil deine
hüpfenden Brüste
Todo esto sucedió por que tus pechos
Todo esto está pasando porque tus pechos
Tutto questo è successo 
perché il suo seno rimbalzante...
Tudo isso aconteceu porque 
você balançou seus peitos