Track One: Different World

After the events of the Don Kanonji recording incident, life seem to become at least semi-normal for the Substitute Shinigami: Ichigo Kurosaki. However, things are never that simple as forces are bringing people from another reality's Japan, both living and dead.
But who is Lelouch Lamperouge and how did he and his younger sister gain the powers of the Shinigami?
(Crappy summary I know but it's almost 3 am when posting this!)