Futari wa Pretty Cure/WMG
Futari wa Pretty Cure is set in the same universe as Mahou Sensei Negima
Evidence: Nagisa and Honoka appearing at the Mahora Festival in the fourth panel. [dead link] How did they end there? Well, after the Dark King attacked Earth directly the mages finally tracked the Pretty Cures, and to keep The Masquerade offered them a scholarship and training in Mahora. It would also explain how they became able to one-shot a Zakenna in the All Stars movies: the training paid off.