The Plot Gods have decreed he has to train a new Robin who is really a magical Japanese school girl. So Batman has to train one of these magical girls into the new Robin. What happens? How does (insert magical girl here) react? Who is the best student? What kind of training is required? How does the training go? What happens if they have to fight for the right to be Robin? And which Magical Girl could most likely pull off that scary Batman glare that has even supervillains that can easily take down Batman gulping a bit in fear? That is a rough stare.
Based on one of my favorite older threads pre-reboot, I just took out the Goddamned part of Goddamned Batman. Any and all magical girls are in this.