The Crusaders are in a Kingdom called Adkabatz, in a war that's filled with magic and good. In the beat up word, the Crusaders search for a mysterious artifact know as the 'Skull Heart'. Once seven years the Skull Heart grants a wish for anyone, and if they have a full heart, they will get a wish and will become the next Skullgirl that has full power.
So the Crusaders go on an adventure to find the Skull Heart, so they fight for themselves to make a wish to get them Cutie Marks.