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Magical Beast Transformation: Hekatonkheires, also known by its nickname Koro, was a biological dog-type Teigu formerly owned by Seryu Ubiquitous, who was often seen with her. It was destroyed by Mine after she destroyed its core and died alongside Seryu during her suicide attempt to kill Mine.


Seryu Ubiquitous receives Koro when she became a member of the imperial police. As Mine and Sheele run through the park, they are ambushed by Seryu, as she vows to take her vengeance over her mentor, Ogre. She unleashes Koro to attack them. Seryu engages Sheele while Mine fights against Koro. As Mine blasts Koro with her Pumpkin, it regenerates from all of her attacks so long as its core is intact. Sheele succeeds in cutting off both of Seryu's arms, only to discover that Seryu also has guns implanted into her arms. Sheele cuts off the guns as well. Facing a dire crisis, Seryu uses her last resort by ordering Koro to go activate its trump card: Berserker. Unleashing a deafening roar, Mine is stunned by its roar and Koro quickly grabs Mine and attempts to crush her bones. Sheele manages to cut off Koro's arms to save Mine. Suddenly, Sheele is shot in the back. The shot came from a gun that was implanted in Seryu's mouth. Sheele is then bitten in half by Koro. Mine cries out to Sheele, who is able to use Extase to emit a blinding light as her trump card, allowing Mine to flee as Koro then devours Sheele, killing her instantly. Since then, Mine vowed to get vengeance upon Seryu and Koro to avenge Sheele. Later, after Chelsea was killed and had her head sliced off by Kurome, Seryu had Koro devoured her body.

Koro appears later as Seryu attacks Mine and Tatsumi at the valley, who narrowly escape. Just then, they are attacked by Suzuka. Tatsumi faces off against Suzuka while Mine prepares to fight Seryu and Koro. During the second battle between Mine and Seryu, Koro attempts to attack Mine, but it suffered a large amount of damage by Mine's Pumpkin due to her increased power, since the more danger she was in, the more powerful her Pumpkin would be, as she blasts him apart with every shot, rendering it unable to fight back as she keeps shooting at Koro until his core is shown, which causes Seryu to once again unleash its trump card, Berserker, but Mine manages to anticipate its roar by putting on her earplugs, negating its sound. While Koro sits out the battle to recover from Mine's shots, Seryu is forced to face Mine herself and manages to beat her insanely with her lighting-speed punches, leaving Mine mortally wounded and nearly dying. As both Seryu and a recovered Koro attempt to attack from both sides, Mine suddenly bifurcates Koro with her trump card, destroying its core, and Seryu is also cut in half by Mine, avenging Sheele. A dying Koro stays by Seryu's side, no longer able to regenerate due to its core suffering heavy damage, as she used a suicide bomb inside herself as her last resort in an attempt to kill Mine, taking out the entire valley, along with herself and Koro.


Hekatonkheires, nicknamed as Koro for short by its last owner, was a biological Teigu resembling a small, white dog with black eyes, ears and a nose that stands on its back legs. When ordered, it had the ability to grow to a much larger size, increasing its strength and durability. It ferociously attacked enemies by devouring them. Koro could also grow large, muscular arms and furiously unleash a volley of punches. Like other biological Teigu, it was able to regenerate if damaged, unless its core was destroyed. The aforementioned core was an orb located within its head.


Later on, with the help of Dr. Stylish's Perfector, both Seryu and Koro's bodies were modified to use a number of highly-advanced weapons branded The Judgement of the Ten Heavenly Kings (|十王の裁き, Jūō no Sabaki). These weapons were stored within Koro's body.

  • Number 1: Shinkou's Ball of Justice (正義秦広球, Seigi Shinkō-kyū): A large flail that can take down a large number of opponents.
  • Number 2: Four missile turrets that can be used to send out a volley of missiles. 
  • Number 3: A large sword with a giant blade. It can execute enemies.
  • Number 4: A hookshot.
  • Number 5: Enma's Spear of Justice (正義閻魔槍, Seigi Enma-sō): A large drill that is capable of mowing down a large number of opponents. It can be launched to be used as a long-range attack. The drill can also explode if necessary. 
  • Number 6: A giant armor-reinforced missile that explodes. 
  • Number 7: Taizan's Cannon of Justice (正義泰山砲, Seigi Taizan-hō): A long-ranged anti-tank rifle with great destructive power.
  • Number 8: An arm with an unknown ability. It was used during her Justice Volley Fire.
  • Number 9: Justice City Detector (正義都市探知機, Seigi Toshi-tanchiki): An arm with a radar that detects living beings in a certain area.
  • Final Number: Chakravartin Furnace of Five Hells (五道転輪炉, Godō Tenrin-ro): A last resort weapon in the event of her defeat, Seryu has an explosive device implanted in her head. The explosion triggered by this suicide attack was easily enough to fill the small valley in which she and Mine had fought their final battle. The destructive power it possesses was proportionately intense, laying waste to the surrounding environment.

Trump Card[]

  • Berserker (戦鬼, Senki): The trump card of Hekatonkheires which would evolve the Teigu into a more bestial form enhancing its physical abilities. In this form, its roar alone was powerful enough to stun opponents. According to Seryu, after using Berserker, Koro would overheat and be unusable for a few days. That statement was proven to be an exaggeration since Seryu was capable of using it again directly after using Berserker. However, it is not completely invincible, as Sheele's Extase is able to cut its arm off and later Mine's increased Pumpkin manages to slice through its body and destroying its core.



  • In Greek mythology, the Hekatonkheires, meaning "hundred-handed ones", were three giants.
  • Berserkers were Norse warriors said to have fought in a wild, trance-like fury. This characteristic later gave rise to the English word "berserk".
  • His nickname, Koro, could refer to the Japanese word "Koroshiya", which means "professional killer".
  • Takahiro uses Koro as his avatar when he makes announcements in regards to the manga.
  • Hekatonkheires apparently consumes a large quantity of food regularly. Its food can be anything, provided that it is meat, as it devours the bodies of both Sheele and Chelsea, as well as some death row prisoners.


V· T·E Jaegers
Faction: The Empire
Leader: General Esdeath
Members: Run · Wave · Kurome
Deceased: Bols · Run · Seryu Ubiquitous · Dr. Stylish
Teigu: Demon's Extract · Grand Chariot · Mastema · Yatsufusa
Lost Teigu: Hekatonkheires · Perfector · Rubicante
Puppets: Apeman · Desta-Ghoul · Doya · Henter · Kaiser Frog · Natala · Rokugoh · Run · Wall