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!

Arata is set to be expelled! The only way to save himself is to be taught more about the magic archives from the Trinity Seven themselves.