Kimetsu no Yaiba Wiki
Kimetsu no Yaiba Wiki

My wounds may have healed since that day, but I cannot control my fear and anger. I cannot stand to live in fear of him! My rage will kill me! Revenge! I will have my revenge... Kyojuro Rengoku!
Hairo to Kyojuro Rengoku in Kyojuro Rengoku's Story: Part 1

Hairo ( (はい) (ろう) Hairō?) is the primary antagonist of Kyojuro Rengoku's Story. He is a demon affiliated with the Twelve Kizuki, having formerly held the position of Lower Rank Two ( () (げん) () Kagen no Ni?).


Hairo is a relatively tall young man with an athletic build. He has incredibly spiky black hair with two chin-length bangs. As a member of the Twelve Kizuki, he has the kanji for Lower ( () Ka?) and Two ( () Ni?) etched on his left eye. Hairo also had many black spike-like patterns framing his face.

He wears an western light suit with a black buckled belt with saggy pants and black boots. Over this, he wears a black cloak similar in appearance to a cape with protruding collars. Finally he wears a white sailor hat with a wolf emblem on its front center.



Hairo appears to have immense anger management issues, coming to the point of him being "suicidal": shooting himself in the head to contain it. The main cause is presumed due to mistreatment from his human life when being a member of the Shinsengumi. Despite his near constant anger, he has shown humbleness, seen when he venerated Kyojuro Rengoku's swordsmanship before his death.


Not much is known about Hairo, but it is known that at some point of his life, he mastered the art of Bushidō but was harassed by a group of marksman who insulted his swordsmanship. At some point when he became a demon, he was nearly killed by Shinjuro Rengoku, but was either spared or escaped, and gained strength, becoming Lower Rank Two.


Overall Abilities: As the holder of the second highest position among the Lower Ranks of the Twelve Kizuki, Hairo is an exceptionally powerful demon. Combined with his marksmanship and swordsmanship skills, he is an extremely formidable foe. As Lower Rank Two, it can be safely assumed that his power exceeded that of the Lower Ranks Kamanue, Rui, Mukago, Wakuraba, and rivaling Rokuro. He was able to stand his ground against Kyojuro Rengoku, dealing great damage to the Demon Slayer and nearly killing him multiple times, albiet Kyojuro was a Kinoe at the time, which is the highest non-Hashira rank of the Demon Slayer Corps. Hairo was also able to immediately subdue Mitsuri Kanroji, who was an inexperienced Demon Slayer at the time. The Lower Rank put up an extremely good fight against Kyojuro, evidently pushing the latter to his limit as he collapsed after the battle, only being defeated when the Demon Slayer unleashed his Rengoku technique.

Enhanced Regeneration: As a member of the Twelve Kizuki, Hairo possesses great regenerative abilities, shown when he regrew his entire upper body in a matter of seconds after having it completely destroyed in an explosion.

Hairo "teleporting" behind Mitsuri.

Enhanced Speed & Reflexes: Hairo possessed decently great movement speed and reflexes, being able to keep up with a Kinoe-ranked Kyojuro, evading many of the Demon Slayer's techniques. He was also able to travel from a building far from Mitsuri to right behind her in an instant, even subduing Mitsuri before she could react.

Skilled Torturer: As stated by Hairo himself, when he was human, he was extremely experienced in torturing people using a variety of methods. Hairo instinctively knew when someone was about to hit their breaking point as long as they are alive. He even has the mindset of someone who enjoys inflicting pain and suffering on others.

Fighting Style

Expert Marksman: With the nearly infinite supply of weapons at his disposal, Hairo has displayed the ability to be extremely proficient in his plethora of firearms and ranged weapons, using them to great effect against Kyojuro.

Expert Swordsman: After depleting his supply of firearms, Hairo switches his combat stance and uses his Bushidō sword technique. His sword skill can even match the likes of Kyojuro, albeit that was when his skill wasn't as polished as when he became a Hashira.

Blood Demon Art

Hairo using his Blood Demon Art against Kyojuro.

Umbrakinesis: Hairo's Blood Demon Art allows him to create and manipulate shadows with special properties and characteristics from his flesh and blood. His shadows have unique shapes and designs on them, ranging from white triangular patterns to eyes. These shadows contain a suction effect with not only absorbs damage from physical attacks, but also makes it extremely difficult to escape when in contact with them. Furthermore, the shadows also have a special property that seemingly gives even a dimensional pocket to store countless items and he can conjure these items from anywhere his shadows occupy. Hairo usually opts to shape his shadows into wolf-like creatures to increase his attack potency and striking range. Otherwise, he would turn parts of his body into his Blood Demon Art to nullify attacks and trap his enemies.

  • Artillery Manipulation: Hairo's shadows contain a countless number of weapons, ranging from pistols to bolt-rifles to shotguns and sub-machine guns, even containing a rotatory mini-gun, molotovs, dynamite and other explosives, and also a large katana. He can command these to fire at will, whether it be from his own body or from shadows he has sent out in the environment as traps, or even from the shadow wolves he creates. However, these guns are real and not mystical, having a significant but limited amount of ammunition. Thus if he runs out of bullets, the guns become useless.


  • Capture Cavity ( () (かく) (こう) Rokaku-Kō?) These techniques involve shaping his shadows into wolf-like entities and using his countless supply of weapons to attack his targets.
    • Shadow Wolves ( (かげ) (ろう) Kagerō?) - Hairo creates multiple shadowy wolves from his blood that emanate from his cloak, these wolves have the same suction effect as his regular shadows and thus can absorb a plethora of physical attacks and make them exceptionally hard to kill. These wolves can also conjure guns and other weapons.
    • Warwolf of Horror ( (せん) () (じん) (ろう) Senka Jinrō?) - Hairo gathers all his shadows to him and cloaks himself in them, transforming into a large shadowy wolf standing on its hind legs, akin to a werewolf.

— Hairo's Blood Demon Art —


Weapons Arsenal: Hairo has a huge arsenal of weapons, both melee and ranged weapons used for combat purposes found around that time period. Ranged weapons include pistols, bolt-rifles, shotguns, sub-machine guns, even containing a rotatory mini-gun, molotovs, dynamite and other explosives. The only close ranged weapon is a standard katana.



  • Hairo's name contains the kanji for "to wear (a sword)" ( (はい) Hai?) and "wolf" ( (ろう) ?).
  • Hairo would usually collect Demon Slayers's Nichirin Sword tsubas as trophies for him killing them.
  • Judging from his flashbacks, Hairo was probably a part of the Shinsengumi, a special police force organized by the Bakufu (military government) during Japan's Bakumatsu period (late Tokugawa shogunate) in 1863.


  • (To Mitsuri Kanroji) "I will subject you to the limits of human suffering... in ways you could never even imagine! You are a victim of my revenge! But it's your fault for joining the Demon Slayers! How pitiful! You corps members die such pitiful deaths... yet no one admires or even knows you!"
  • (To himself, then Kyojuro Rengoku) "My wounds may have healed since that day, but I cannot control my fear and anger. I cannot stand to live in fear of him! My rage will kill me! Revenge! I will have my revenge... Kyojuro Rengoku!"
  • (To himself) "Impossible! I shot him with bullets... and caught him in multiple explosions... so why won't he fall?! Why face me with nothing but a katana? He's just a pathetic human! Why is he coming at me with a mere sword? How can this human stand up against me? That guy... Is the warrior before me now... really the one I encountered that day?"
  • (To Kyojuro Rengoku) "I admire... your swordsmanship."