It has been about a month since the Armed Detective Agency, in collaboration with the Port Mafia, won the "cannibalism" operation masterminded by the "Rats in the House of the Dead". The Armed Detective Agency was awarded the highest medal for safety contribution, the Order of the Azusa Bow of Exorcism, and was praised by the whole country. Then an urgent request from the government comes in. The four murders of the young senators were likened to the five signs of the mortality of the highest heavenly being of Rokudo Rinne, the Six Realms of Reincarnation. The Armed Detective Agency sets out to prevent the remaining murder from happening. But it turns out to be a trap set by the cunning "Demon" Fyodor, who was supposed to have been captured...! Officials of the government are suspicious of the justice they uphold. A special unit of the military police, the "Hunting Dogs," is ready to take action. The "Decay of the Angel" are roaming the streets to bring about the destruction of the world. The Armed Detective Agency, which has been slandered by the public since its glory, faces new enemies one after another and its bottomless despair. With their friendship falling apart, will Nakajima Atsushi be able to overcome this unprecedented crisis? With no glimmer of hope in sight, the battle is about to begin...

Source: Crunchyroll

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Prequel: Bungou Stray Dogs (2019)
Sequel: Bungou Stray Dogs (2023, TV)