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Knowing the foundations of Public Safety’s special division and the true weight of Denji’s destiny will only elevate this thrilling new chapter to an already explosive story.
10) The Concept of a Hybrid Devil
Hybrids are incredibly rare beings that result from a human merging with a devil, retaining a human-like mind and appearance unless they transform. Unlike Fiends (who are devils possessing a human corpse), a hybrid can typically return to their human form and have a distinct devil feature, like Denji’s pull-cord, which activates their full devil power.
These unique people are essentially immortal and functionally unkillable as long as they have access to blood, which allows them to regenerate even from near-total destruction. Their power makes them highly coveted and feared by both humans and devils, putting them at the center of many conflicts, as their existence fundamentally breaks the traditional rules of the world.
9) Allies and Other Devils
Denji’s work with the special division brought him into contact with several humans and non-human allies. The humans include people like Aki Hayakawa and Kobeni Higashiyama, who have devoted themselves to the fight against Devils. Denji’s other allies include beings known as Fiends, like Power (the Blood Fiend). Fiends are devils who have taken over a human corpse, which typically results in a bizarre change to their physical appearance and a loss of much of their original devil’s intelligence.
Beyond the Fiends, other devils, like the Angel Devil, work for Public Safety under Makima’s direct supervision. While these alliances are necessary to take on greater threats, they are built on shaky trust, as devils are typically self-serving and their loyalty can shift based on their own survival or desires.
8) The Gun Devil
The Gun Devil is one of the most powerful and destructive devils in existence, responsible for a catastrophe 13 years before Season 1 that claimed the lives of millions globally within five minutes. Public Safety’s primary mission is to gather pieces of its flesh or information to track it down, as it remains the single greatest threat to human civilization.
For Aki Hayakawa, this devil is personal, as it was responsible for the death of his entire family, fueling his singular, desperate drive for revenge. His life’s work is consumed by this goal, and his willingness to make dangerous pacts is entirely based on the hope of one day confronting and killing the Gun Devil and ridding the world of its evil.
7) Aki’s Deal With the Future Devil
Seeking greater power to avenge his family, Aki made a pact with one of the strongest devils—the Future Devil. In exchange for the devil taking over his right eye, granting him the ability to see a few seconds into the future, Aki agreed to drastically shorten his own lifespan.
This pact is a constant reminder of the high cost of power in this world and Aki’s desperation. Every time he uses his enhanced vision, he is essentially gambling his remaining time on Earth, highlighting his grim, determined commitment to his personal war against the Gun Devil.
6) Denji’s Dream Life
Despite his extraordinary powers as the human-hybrid Chainsaw Devil and involvement in world-threatening conflicts, Denji’s personal motivation remains wonderfully mundane: he simply wants a normal life that includes getting a girlfriend. Denji’s desire reminds the audience that he is still just a teenager, and it is a reaction to his former life of extreme poverty and isolation.
His deepest wishes are simple, non-heroic pleasures: sleeping in a soft bed, eating good food, and forging bonds. This relatable and very human goal serves as a constant, grounding counterpoint to the terrifying and chaotic devil world in which he lives, defining his actions far more than any sense of duty.
5) Division 4’s Main Trio
Public Safety’s Special Division 4 is largely defined by the strange, dysfunctional partnership between Denji and his two closest friends: Power, the Blood Fiend; and Aki, the singularly driven, human devil hunter. The trio’s connection is the emotional core of the series, evolving from begrudging coworkers to a genuine (and very chaotic) surrogate family.
