The White Cat's Revenge as Plotted from the Dragon King's Lap, Vol. 1

My life was pretty ordinary. Go to college, live in an apartment, hang out with people. But because of that pompous, irritating girl I grew up with, I got dragged into a huge mess. As usual. Now I'm in another world where she's a well-respected shrine maiden...and I got turned into a cat. How did it come to this?!