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Aki Hayakawa is a Public Safety Devil Hunter and a central figure in the Special Division 4. He was born and raised in Hokkaido, where he lived with his parents and his younger brother, Taiyo. His childhood was shattered when the Gun Devil attacked, slaughtering his entire family while Aki was outside and thus the sole survivor. This traumatic event became the defining moment of his life, fueling a deep-seated and obsessive desire for revenge against the Gun Devil. Driven by this goal, he joined the Public Safety Devil Hunters at the age of sixteen.
On the surface, Aki presents himself as a stoic, serious, and highly disciplined individual. He is dedicated to his work and believes that only those with strong inner convictions can survive as Devil Hunters. He often comes across as cold, strict, and blunt, especially in his early interactions with the more chaotic characters he is forced to work with. This cool detachment, however, is largely a facade. Beneath his stern exterior, Aki is a kind, empathetic, and surprisingly softhearted person. His former partner, Himeno, accurately describes him as cool, serious, and kind. He is not ruthless enough to completely abandon his humanity, and he hates to see people he cares about get hurt. This sensitivity causes him to grieve deeply for fallen comrades, a trait that makes him feel like a normal person in an otherwise brutal and jaded profession.
Aki's primary motivation for becoming a Devil Hunter is to avenge his family by killing the Gun Devil. For a long time, this revenge quest consumes his entire identity, and he is willing to sacrifice anything, including his own lifespan and body, to achieve it. He cultivates a hatred for all devils, viewing them merely as disposable tools. However, as the story progresses, his priorities begin to shift. His growing bonds with Denji and Power, two devils he is assigned to supervise and live with, create a new, surrogate family for him. This newfound connection gradually becomes more important than his old vendetta. He eventually reaches a point where he is willing to set aside his revenge to protect Denji and Power, fearing he might lose them as he lost his original family.
Aki's role in the story is multifaceted. He is initially presented as a senior and foil to the protagonist, Denji, representing the grim reality of a Devil Hunter's life as opposed to Denji's simplistic, desire-driven worldview. Under Makima's orders, he becomes the handler and guardian for both Denji and Power, forcing them to live in his apartment. This transforms his solitary home into the chaotic Hayakawa household, where he acts as the beleaguered but responsible older brother figure. He is responsible for teaching them basic human etiquette, cooking for them, and keeping their more destructive impulses in check. Beyond his domestic role, he is a key combatant in Special Division 4, using his tactical mind and devil contracts to fight in numerous missions.
Aki’s relationships are central to his character development. His partnership with Himeno is one of the most significant. As his senior partner, she trained him, introduced him to smoking, and constantly worried about his self-sacrificing obsession with revenge. Her death during a mission leaves him devastated and further fuels his hatred, but her memory continues to influence him. His relationship with Denji begins with mutual hostility and disdain, as Aki sees Denji as a frivolous idiot. Through shared missions and cohabitation, this rivalry softens into a deep, brotherly bond. Aki comes to respect Denji’s determination and ultimately cares for his safety above his own lifelong goal of revenge. Similarly, his relationship with Power evolves from annoyance and distrust to that of a tired caretaker who, despite her selfish and childish behavior, comes to see her as an irreplaceable part of his family. Aki also harbors deep respect and an unrequited affection for his superior, Makima, viewing her as his savior. This loyalty, whether genuine or influenced by her control powers, makes him a willing tool in her hands and contributes directly to his tragic fate. Finally, his relationship with the Angel Devil starts with mutual antagonism but grows into genuine trust and care, with Aki willingly sacrificing his own lifespan to save Angel’s life.
Throughout the series, Aki undergoes significant development. He starts as a man singularly focused on revenge, willing to throw his life away. His time living with Denji and Power humanizes him, allowing him to rediscover the warmth of a family. He becomes less driven by hatred for the past and more motivated by the desire to protect his present. This change is tragically cut short. During the final confrontation with the Gun Devil, Makima uses her powers to force Aki into a contract, leading to his death. His corpse is then possessed by twenty percent of the Gun Devil, transforming him into the Gun Fiend. In this monstrous form, he unknowingly massacres civilians while hallucinating that he is having a simple, joyful snowball fight with Denji. In a heartbreaking conclusion, Denji is forced to kill the Gun Fiend. In his final moments, Aki’s spirit finds peace, reuniting with his younger brother Taiyo to finally play the game of catch they never got to finish.
As a Devil Hunter, Aki is highly trained and skilled, having received special training from Kishibe, the strongest Devil Hunter. He is a proficient swordsman and hand-to-hand combatant. His effectiveness in battle is augmented by several contracts with devils. He initially has a contract with the Fox Devil, summoning its head to devour enemies by saying Kon, but loses this contract after using it recklessly. He also wields a nail-like sword from the Curse Devil; stabbing an enemy three times with it summons the Curse Devil to kill them, but this drastically shortens the user's lifespan, leaving Aki with only two years to live. After losing the Fox Devil and retiring the Curse Devil's sword, he forms a contract with the Future Devil. The Future Devil resides in Aki's right eye, granting him the ability to see a few seconds into the future to predict enemy attacks. The price for this power is that the Future Devil gets to witness the moment of Aki's gruesome death. He later also uses a katana created from the Angel Devil’s power, which can cut through intangible objects.
On the surface, Aki presents himself as a stoic, serious, and highly disciplined individual. He is dedicated to his work and believes that only those with strong inner convictions can survive as Devil Hunters. He often comes across as cold, strict, and blunt, especially in his early interactions with the more chaotic characters he is forced to work with. This cool detachment, however, is largely a facade. Beneath his stern exterior, Aki is a kind, empathetic, and surprisingly softhearted person. His former partner, Himeno, accurately describes him as cool, serious, and kind. He is not ruthless enough to completely abandon his humanity, and he hates to see people he cares about get hurt. This sensitivity causes him to grieve deeply for fallen comrades, a trait that makes him feel like a normal person in an otherwise brutal and jaded profession.
Aki's primary motivation for becoming a Devil Hunter is to avenge his family by killing the Gun Devil. For a long time, this revenge quest consumes his entire identity, and he is willing to sacrifice anything, including his own lifespan and body, to achieve it. He cultivates a hatred for all devils, viewing them merely as disposable tools. However, as the story progresses, his priorities begin to shift. His growing bonds with Denji and Power, two devils he is assigned to supervise and live with, create a new, surrogate family for him. This newfound connection gradually becomes more important than his old vendetta. He eventually reaches a point where he is willing to set aside his revenge to protect Denji and Power, fearing he might lose them as he lost his original family.
Aki's role in the story is multifaceted. He is initially presented as a senior and foil to the protagonist, Denji, representing the grim reality of a Devil Hunter's life as opposed to Denji's simplistic, desire-driven worldview. Under Makima's orders, he becomes the handler and guardian for both Denji and Power, forcing them to live in his apartment. This transforms his solitary home into the chaotic Hayakawa household, where he acts as the beleaguered but responsible older brother figure. He is responsible for teaching them basic human etiquette, cooking for them, and keeping their more destructive impulses in check. Beyond his domestic role, he is a key combatant in Special Division 4, using his tactical mind and devil contracts to fight in numerous missions.
Aki’s relationships are central to his character development. His partnership with Himeno is one of the most significant. As his senior partner, she trained him, introduced him to smoking, and constantly worried about his self-sacrificing obsession with revenge. Her death during a mission leaves him devastated and further fuels his hatred, but her memory continues to influence him. His relationship with Denji begins with mutual hostility and disdain, as Aki sees Denji as a frivolous idiot. Through shared missions and cohabitation, this rivalry softens into a deep, brotherly bond. Aki comes to respect Denji’s determination and ultimately cares for his safety above his own lifelong goal of revenge. Similarly, his relationship with Power evolves from annoyance and distrust to that of a tired caretaker who, despite her selfish and childish behavior, comes to see her as an irreplaceable part of his family. Aki also harbors deep respect and an unrequited affection for his superior, Makima, viewing her as his savior. This loyalty, whether genuine or influenced by her control powers, makes him a willing tool in her hands and contributes directly to his tragic fate. Finally, his relationship with the Angel Devil starts with mutual antagonism but grows into genuine trust and care, with Aki willingly sacrificing his own lifespan to save Angel’s life.
Throughout the series, Aki undergoes significant development. He starts as a man singularly focused on revenge, willing to throw his life away. His time living with Denji and Power humanizes him, allowing him to rediscover the warmth of a family. He becomes less driven by hatred for the past and more motivated by the desire to protect his present. This change is tragically cut short. During the final confrontation with the Gun Devil, Makima uses her powers to force Aki into a contract, leading to his death. His corpse is then possessed by twenty percent of the Gun Devil, transforming him into the Gun Fiend. In this monstrous form, he unknowingly massacres civilians while hallucinating that he is having a simple, joyful snowball fight with Denji. In a heartbreaking conclusion, Denji is forced to kill the Gun Fiend. In his final moments, Aki’s spirit finds peace, reuniting with his younger brother Taiyo to finally play the game of catch they never got to finish.
As a Devil Hunter, Aki is highly trained and skilled, having received special training from Kishibe, the strongest Devil Hunter. He is a proficient swordsman and hand-to-hand combatant. His effectiveness in battle is augmented by several contracts with devils. He initially has a contract with the Fox Devil, summoning its head to devour enemies by saying Kon, but loses this contract after using it recklessly. He also wields a nail-like sword from the Curse Devil; stabbing an enemy three times with it summons the Curse Devil to kill them, but this drastically shortens the user's lifespan, leaving Aki with only two years to live. After losing the Fox Devil and retiring the Curse Devil's sword, he forms a contract with the Future Devil. The Future Devil resides in Aki's right eye, granting him the ability to see a few seconds into the future to predict enemy attacks. The price for this power is that the Future Devil gets to witness the moment of Aki's gruesome death. He later also uses a katana created from the Angel Devil’s power, which can cut through intangible objects.