Durarara!! Vol. 12 (light novel)

Ikebukuro is beginning to come apart at the seams. Shinra is still gone
after being stabbed by Saika. And the headless rider who lost him slowly becomes
more of a monster. Masaomi is injured thanks to Izumii, and Saki has a lot of
questions for Anri. The unconscious Kadota disappears from the hospital, and
Celty's head is passed from person to person. And Mikado gains a mysterious
power...