Framed and convicted of murder, Yoshiaki Maeda has just arrived at Shouran Academy Juvenile Detention Center. He is placed in Cell 4 and is soon greeted by his fellow inmates Gou Iwakura, Masafumi Yoshioka, and Mitsuru Yamanoi, all of whom have been detained on varying charges and sentences. Already believing life to be laden with misfortunes, Yoshiaki finds, to his dismay, that the prison is in the midst of a violent power struggle. However, things are about to get even worse—little do the inmates and employees know that the outside world has been thrown into chaos by a sudden zombie apocalypse, and a van carrying infected humans has just crashed into the prison, abruptly introducing them to the undead threat. [Written by MAL Rewrite]

Apocalypse no Toride was serialized in Shounen Rival until its discontinuance in June 2014 (2014-07). The last 12 chapters of the series were published on Kodansha's Shin Zasshi Kenkyuujou website from August 19, 2014, to August 4, 2015. The series was simulpub in English as Fort of Apocalypse by Crunchyroll since October 30, 2013. Kodansha Comics USA released the series digitally from November 3, 2015, to January 12, 2016. It was also published in Italian by Panini Comics from April 30, 2015, to October 13, 2016; and in Brazilian Portuguese by Editora JBC from March 3, 2017, to December 13, 2017.