Episode 50

Skyfall (stylized as SKYFALL), is the 50th episode of Bungo Stray Dogs anime series and the thirteenth episode of the fourth season. It aired on March 29, 2023.

Summary
Teruko and Tachihara flee from the casino hotel guests trying to attack them for Sigma's bounty. The Hunting Dogs quickly hide in a room where the guests find an old woman with a cart; the guests exit once finding a rope leading out the window. Having altered her own age and Tachihara's, the old woman turns out to be Teruko and heads to a secured area where she incapacitates the unknowing guards. Teruko soon de-ages herself and uses her ability on the guards to interrogate them, acquiring intel on how to take control of the casino's central control terminal.

In Meursault, Dazai is dubious of Fyodor's reasoning on Sigma being the strongest as an amnesiac, especially against the Hunting Dogs. Fyodor rebuts that Sigma is way above anyone else, even the Hunting Dogs and the two of them, with his absolute alienation. He reveals Sigma to have been written into the book three years ago and given a home in the form of the Sky Casino.

Teruko confronts Sigma in the comms room to retrieve the terminal key. However, Sigma tosses her the key, pledging to himself to stop the Hunting Dogs to save the casino despite admitting being an ordinary man himself. Once Teruko takes the key, Sigma activates twin turrets and launches a barrage at Teruko. Meanwhile, Atsushi hears fighting and deduces the Hunting Dogs to be clashing with Sigma; Kyōka directs him to head to the battle.

Deflecting the instantaneous bullets her bare hands, Teruko breaks the turrets and corners Sigma, who then attacks Teruko with his personally modified Directional Resonance Gun armed with his determination. Initially caught in the acoustic assault, Teruko resists the effect after gouging her ear canal and destroys his gun, once again cornering Sigma. She avows the Hunting Dogs' own determination as the manifestation of the country's order.

Teruko issues her ultimatum to Sigma to surrender at the casino's edge. Sigma continues to refuse, claiming that an ordinary man can overcome any wall with enough desperation, though Teruko asserts that beyond that wall is a battle with equally desperate geniuses. Choosing to save the casino, Sigma grabs Teruko to fall with him mid-air.

As they grapple and leave Sigma to fall by himself, Atsushi saves him to get him to talk about the page's location. With Ango on standby for the interrogation for Taneda's attacker, Sigma yields and cooperates, having not found his reason for being. Not long after, however, Nathaniel hovers before them; Ango warns Atsushi of Sigma's possible ally, but Nathaniel attacks Sigma instead and later Atsushi when he tries saving Sigma from falling over.

Dangling in dire straits, Atsushi does not allow Sigma to let him go, not wanting him to die oblivious of his own reason for being. Sigma remarks on Atsushi's kindness and, claiming that he did all that he can as an ordinary man, lets go of Atsushi's hand. Ango directs Lucy towards Atsushi mid-air, where she jumps off the ledge to transport him and herself to Anne's Room.

Upon successfully landing in the dimension, Atsushi saves Lucy from Nathaniel's blood bullet that grazes her. Atsushi notices a thin string of blood connected to him, deducing it to be Nathaniel's way of getting inside and grows worried. Lucy, however, is confident in Nathaniel's loss, revealing that Anne cannot be harmed inside the dimension. Nathaniel is easily dragged into her prison room, and Lucy turns joyful at their victory.

However, Ango notes that they lost; from letting Sigma die and losing their only lead towards locating the page, to the Hunting Dogs witnessing Atsushi saving a perceived fellow terrorist, he declares that they played right into Fyodor's hand.

Dazai turns challenged with Fyodor's play despite the latter asserting not having done anything except pray to God. With Dazai figuring out that the coin bombs were a decoy to draw the Hunting Dogs and the Agency to the casino, Tachihara finds a flash drive containing Atsushi's revelation about the Decay of the Angel's theft of the page and their global terrorist plan, including the demise of the state.

Fyodor notes on the necessity for perfection and harmony when he wrote on the page that law enforcement and investigative bodies shall dismiss any evidence about the Agency's frameup, giving them on chance whatsoever to ally with the Hunting Dogs. Teruko assigns Tachihara to infiltrate the Mafia once more in order to catch any intel regarding the missing Kenji and Tanizaki amidst Tachihara's own reluctance.

Tachihara recalls to his hospital visit to Hirotsu and Gin, who both survived mild injuries at the attacker's hands. Tachihara asked Hirotsu whether he is suitable to be in the Mafia, to which Hirotsu and Gin simply laughed at his question. Dazai likewise laughs at Fyodor's remark and retorts that the world is run by those who act amidst incidental storms in the face of God's coincidences and absurdisms rather than those who values perfection and harmony.

Hirotsu responded that Tachihara is Mafia among Mafia and is a paragon for the organization. Coming to terms with his own motive for joining the Mafia, Tachihara resolved having joined to become someone far from being his brilliant brother nor his opposite, reason why he spared Yosano during their previous confrontation before she apologized to him.

Tachihara also thinks back to Mori's own belief that the Agency is innocent ever since the start and, during his hospital visit, asked his fellow Black Lizard commanders about their thoughts on the Agency's innocence, who plainly stated that the Agency are not terrorists.

With all these recollections, Tachihara finally comes to the realization that the Agency is innocent. With the page's influence on him as a Hunting Dog wearing off due to his own re-acknowledgement as a mafioso, Tachihara claims that they have to persuade the government of having caught the wrong people.

Dazai shares Fyodor's sentiment that humans are indeed foolish but refutes that they are not as boring as he thinks. Meanwhile, nearing his final falling spot, Sigma notices Nikolai, alive and well, awaiting him. The clown then mirthfully prepares to perform some of his resurrection magic.