Dian and Dianna are twin sisters who got separated from their parents.

HIGHEST RANK: #1 IN ACTION. A war is coming... in search of the hidden Global Treasure. The Queen will rise.... TO WELCOME THEM TO HELL. This is a place where all their enemies will suffer. And this is a place where all the Demon lives... Under the Demon Queen's command. You must obey or DIE. Cause this is... The Delinquent's University.