Dansho no Grimm XIII Shiawase na Ouji (Part 2)

is the thirteenth volume of the Dansho no Grimm light novel series, written by Gakuto Coda and Illustrated by Mikazuki Kakeru. It was released under the Dengeki Bunko Imprint in October 2010.

Synopsis
A letter left by a dead girl hanging her neck in the hospital. There was a scent of revenge from Anna Asai, who was bullying them. Anna, who died a mysterious death that has not been clarified yet, and Ryosuke Tashiro, who continues to escape with her resurrected girlfriend. Aoi and Yukino follow the two and try to contact their classmates.

(source: Bookwalker JP - Translated)