Bleach: Civil War

This arc focuses on an uprising lead by the most unsupecting foe, against the Gotei 13 and a full-blown war that ensues.

Overview
A new race was discovered by the Gotei 13 soon after the Qunicy-Blood war, daemons. Their king, Lucifer, has taken Shiroi Senko, a shinigami turned daemon, with him to their realm and has left the Gotei 13 in a period of disarray and reorganization. Shunsui Kyoraku, is leading the Gotei 13 and has put in place several military reforms to further organise the Seireitei. He has created another special division of the Gotei 13, The Rukongai Shikkō (Wandering Soul City Enforcement). This has lead to a series of revolts and public mockeries from the Central 46, who are supposed to govern the Rukongai and may escalate to war.