TouyaSpoil Spoiler Alert: The following article has information not currently present in the anime or manga. Do not proceed unless you want to be spoiled.

Kokuyou (黒曜, Kokuyou?) formerly known as The Black Emperor (玄帝, Gentei?) is a companion and contracted beast of Touya on his journey. He is the half of the Genbu (玄武, Genbu?), the other half is Sango and they are one of the Four Divine Beasts and also the leader of the Scaled Creature.


Kokuyou's true form is a large jet black serpent as big as an anaconda with a pair of golden eyes. They both are an union being and inextricable. After Kohaku told them about the trouble that they might cost because of their form, they then changed their appearance in similar way to the Kohaku's form.[1]


Kokuyou shown to be an okama as he speaks in feminine way and uses feminine pronouns.


The Genbu (玄武, Genbu?) which later known as, Kokuyou and Sango, are one of the divine beast that can manifest in the world once every few decades or centuries, unless they are being summoned by human [2].


  • Intimidation Aura: Kokuyou and Sango are able to release suppressing aura that render all individual, which have lower magic level in respect to the divine beast, becomes immobile.
  • Long-Ranged Telepathic Communication: Kokuyou and Sango are able to make telepathic communication with their master and among the divine beasts regardless the distance. They also able to include other people into this communication line.
  • Form Transformation: Kokuyou and Sango are able to change her menacing true form appearance into cute young beast form (Child Form) and back as they pleased.
    • Floating: When in his Child Form, Kokuyou who is riding Sango can float in the air while by doing so, it is reducing Sango's movement speed[3].
  • Magic Barrier: Kokuyou and Sango have magic barrier that is able to repel all type of physical attack completely and also all type of magical attack with respect of the caster magic level[4].



  • According to the character introduction, even though Kokuyou is a male, in heart he is a female[5].
  • Their epithet, Gentei (玄帝), is composed by "gen" (玄) of Genbu and "tei" (帝) which means emperor. Literal translation of this word is "emperor of Gen", which is meaningless. However the character "gen" (玄) of Genbu can be also read as kuro (くろ kuro) which mean black. Therefore, Gentei (玄帝) is best translated as black emperor.


  1. Web Novel Chapter 9 #63
  2. Web Novel Chapter 22 #190
  3. Web Novel Chapter 9 #64
  4. Web Novel Chapter 9 #64
  5. Web Novel Chapter 23 #200


Four Divine Beasts
Master: Touya Mochizuki
Members: Kohaku  •  Kokuyou and Sango  •  Kougyoku  •  Ruri
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Affiliation: Brunhild Dukedom
Brunhild Dukedom
Monarch: Touya Mochizuki  •  Linze Silhoueska  •  Elze Silhoueska  •  Yae Kokonoe  •  Yumina Ernea Belfast  •  Leen  •  Sushie Ernea Ortlinde  •  Lucia Rea Regulus  •  Hildegard Minas Restia  •  Sakura
House of Mochizuki: Karen Mochizuki  •  Moroha Mochizuki  •  Kousuke Mochizuki  •  Sousuke Mochizuki  •  Karina Mochizuki  •  Suika Mochizuki  •  Takeru Mochizuki  •  Regina Babylon  •  Paula  •  Laim  •  Lapis  •  Cecil  •  Renne  •  Julio  •  Claire
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Alliance: Kingdom of Belfast  •  Kingdom of Mismede  •  Rifurisu Empire  •  Regulus Empire  •  Ramisshu Holy Kingdom  •  Kingdom of Lihnea  •  Restia Knight Kingdom  •  Federation State of Rhodomea  •  Xenoas Demon Kingdom  •  Eashen
Locations: Silver Moon Inn  •  Fashion King Zanac
Group: Gynoids of Babylon  •  Four Divine Beasts  •  Bride Conference