Negima! 25

A TRICK OF FATE
 
When the Festival of Ostia begins, Fate Averruncus emerges from hiding to set his evil plans into motion. But first he gives Negi a proposition. If Negi promises not to interfere with Fate’s plot, he will allow Negi and the girls to go home unharmed. Now Negi must choose between his students and an entire world.