Naoki Urasawa’s 20th Century Boys 18: Everybody’s Song

Far, far from Tokyo, a man approaches the checkpoint at the Northern Border... Everyone north of the gate is dead, but here he comes on a motorbike with a guitar strapped to his back. Who is this man who calls himself Joe Yabuki, and why does he break out in song? Is he a Messiah here to save the people, or is he just a deluded nut?