Midoriya Izuku becomes a pony when magic intervenes in his suicide attempt. Hijinks ensue across worlds and dimensions as he strives to become the greatest hero that ever lived.
My faithful student, Twilight. I ask that you please come to Canterlot immediately. I have an important task for you to take. This task will help us get a better understanding of species other than pony kind. Your teacher, Princess Celestia.