Once Upon A Time, a filly looked up into the stars and wished for a friend. She got more than what she wished for when a dragon starts to live in her attic. That dragon apparently loves geometry and worshiping the devil.

My name is Blank Stripe. Pretty nice name huh? [Can you not feel my pain] because of my terrible name no pony wants to be my friend. When my cousin, Diamond Tiara comes for a visit things only get worse. Then the dragon shows up and we become best friends, except for one problem. . .he loves geometry and the devil.