In order to become a mage, you need a research theme which archives one of the seven deadly sins. While thinking about what his theme will be, Arata and 3 others are locked in a barrier, with no exit to be found. But then Lilith and the others find themselves needing to use the restroom... Good luck, girls!
And the seven deadly sins are their Archives.
Und das kriegen sie, indem sie die
sieben Todsünden archivieren.
Debes escoger este último de los 
Archivos de los siete pecados capitales.
Debes escogerlo de los Archivos 
de los siete pecados capitales.
Ce thème doit être tiré d’un des sept
péchés capitaux, appelés les archives.
Inoltre... i sette peccati capitali sono il suo Archivio.
Elas fazem isso buscando
os sete pecados capitais.