Kingdom Hearts: Lelouch of Infinite Hearts

Following a strange dream Lelouch gains a mythical weapon known as a Keyblade, but shortly afterwards Ashford Academy is attacked. Nunnally is abducted and he is cast away to another world. Now Lelouch must learn to use it and find allies to save his sister as others begin obtaining the Keyblade setting the stage for a conflict unlike no other. Multi-series crossover.