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"Listen to me, Kyōka. I know how you feel. But... some things are simply impossible. No matter how much a natural-born assassin like you seeks light... A flower that blooms in the dark can survive only within the dark. If you pursue the light, its heat will burn you up in the end."

— Kōyō to Kyōka Izumi[1]

Kōyō Ozaki (尾崎 紅葉, Ozaki Kōyō?) is a Port Mafia executive wielding the ability Golden Demon.


Kōyō is a tall and slender woman with cherry red eyes and light, scarlet hair tied into a traditional Japanese bun that is held by three long golden pins and another hair clip on the right side of her head, composed by a light pink furry hair clip and red ribbon which forms a five-petal flower, and violet eyes.

She dons a pink kimono overlapped by dark purple with bell-flower motifs, tied neatly with a maroon bow which has white borders, and a light pink mantle which goes darker in colour from her elbow to her feet. She wears a red eye shadow and light pink lipstick.

She has three chopstick hair pins holding her hair bun.[note 1] She wore a traditional Japanese kimono based with patterns of spider lilies. Her nails dyed blood red and she carries herself with regal grace.

Kōyō carries a red Japanese umbrella that conceals her sword.

In order to steal a document as a gift to Kyōka Izumi, she disguised herself as a postman to attack a Special Division for Unusual Powers' transport vehicle.[3]



Kōyō sheds tears.

Kōyō holds herself with grace and dignity but wastes no efforts hiding her dark nature. As a result of her failed escape from the Port Mafia, Kōyō is an extreme cynic, jaded against things like hope and love. Kōyō doesn't believe in the benefits of 'light' and claims that people born in 'darkness' are destined to never branch out for the light. With her eloquent speech, Kōyo often equates people to flowers. Some born in darkness, some destined to wilt. In her own words, "they [flowers] never have the chance to drop... if they remain mere buds", indicating she believes that no one will always remain pure and that that purity is a waste compared to how they are when they fall. As a result, Kōyo both detests and fears 'light', thinking there's nothing but disappointment and despair once exposed.[4]

Kōyō's direct express of distain.

Around her comrades, Kōyō maintains her composure but has a much more laid back approach, and enjoys leisure time with her peers, such as the mafia's boss and her fellow executive.[5] Towards others like Ace, however, she isn't the least bit subtle in her distrust and comes off very passive-aggressive.[3]

Kōyō teases Atsushi.

For all her grace, Kōyō's intense mindset leaves her prone to lashing out with cruel words and violent attacks - nothing out of the ordinary for a mafioso.[1][6] Ruthless and brutal, Kōyō seldom holds back in a battle, only doing so for Kyōka Izumi's sake, and she is not above attacking when her target isn't looking.[6]

After their hostility lowers, Kōyō extends some of her humor towards Atsushi Nakajima, but only once thus far, making a joke about how Osamu Dazai got information and cooperation out of her.[7]

Kōyō mentored Kyōka, consequentially being the cause of Kyōka's extreme fear of change when she first joins the Armed Detective Agency. For some time, Kōyō drilled a dreary, hopeless mindset into Kyōka to ensure she would never leave the mafia. She goes as far as to lie by telling Kyōka she's directly responsible for her own parents' murders, poisoning Kyōka's mind.[4]

"Stop! You'll hit Kyōka!

Claiming this to be only for Kyōka's well-being, Kōyō projects her frustrations with life onto Kyōka. It takes Dazai's input for Kōyō to finally stop obsessing over Kyōka's defection and let the girl grow and think for herself. Nonetheless, Kōyō's attachment to Kyōka drives her to intercept a Special Division for Unusual Powers armed transport vehicle – leaking the true events of Kyōka's past to the girl[3] – and later makes a point of never physically harming Kyōka during the Cannibalism operation.[6] This careful mindset extends somewhat to other detectives, however, Kōyō only states that she dislikes the thought of harming Kyōka's friends.

Far from fearless, even Kōyō panics at the possibility of suffering through Dazai's infamous torture methods.[8]


Main article: Golden Demon

Kōyō has the ability to control the Golden Demon (金色夜叉, Konjiki Yasha?), a sword-wielding phantom. It is the same type of ability as Kyōka's, but she can control it with her own will.

Golden Demon (金色夜叉, Konjiki Yasha?)
GoldenDemonCropped.png Manga Debut: Chapter 17
Anime Debut: Episode 17
Ability: Materialized Guardian


Kōyō's attempt at escaping Port Mafia, alongside an unknown man.

When young, she tried to leave the Mafia together with a man whom she admired. Nevertheless, they were caught and the man was killed. Since then, she has held a grudge only against the Mafia's former leader who did those heinous acts.[7]

A year after Ōgai Mori takes over the mafia, Kōyō is assigned to oversee (not necessarily mentor) Chūya Nakahara, after he joins the Port Mafia. As a result, Chūya answered directly to her much of the time. Although she feels exasperated and too young to be called 'ane-san' (姐さん, literally "elder sister"?) by the boy, it's clear she later grows to accept it when she gets older.


Main article: List of Battles
The Guild Arc
Cannibalism Arc
Jun'ichirō Tanizaki and Kyōka Izumi vs. Kōyō Ozaki Jun'ichirō Tanizaki and Kyōka Izumi vs. Kōyō Ozaki Win over Tanizaki (interrupted by Kyoka)


Manga Appearances
Chapters in order of appearance
Anime Appearances
Episodes in order of appearance



  • The name Kōyō means "crimson, deep red" (紅) () and "leaf" (葉) (), Kōyō itself means "Autumn leaves".
  • Kōyō's surname Ozaki means "tail" (尾) (o) and "cape, peninsula" (崎) (saki/zaki).


Main article: Real-life References#Kōyō Ozaki
Kōyō Ozaki (Jan 10, 1868 – Oct 30, 1903)
OzakiRL Thumbnail.png
A male writer, Ozaki was regularly published in the Yomiuri Shimbun, Japan's largest newspaper and formed Japan's first literary society named Ken'yuusha. Among his many writing pupils was Kyōka Izumi. His novel, The Golden Demon, concerns the loss of humanity, social responsibility, and love in the face of money.[9]


  • Kōyō is one of the only characters to refer to Mori by his first name.
  • The real-life Kōyō Ozaki was male and his name was Tokutaro Ozaki (尾崎 徳太郎).
    • Ozaki was the mentor of Kyōka Izumi, with the latter viewing Kōyō as a teacher even outside of literature.
  • Ozaki shares her birthday with Yukichi Fukuzawa, on January 10.


  1. 1.0 1.1 Bungo Stray Dogs Manga: Chapter 18.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Bungo Stray Dogs Manga: Volume 5.
  3. 3.0 3.1 3.2 Bungo Stray Dogs Manga: Chapter 43.
  4. 4.0 4.1 Bungo Stray Dogs Manga: Chapter 17.
  5. Bungo Stray Dogs Manga: Chapter 37.
  6. 6.0 6.1 6.2 Bungo Stray Dogs Manga: Chapter 48.
  7. 7.0 7.1 Bungo Stray Dogs Manga: Chapter 26.
  8. Bungo Stray Dogs Manga: Chapter 19.
  9. Bungo Stray Dogs Manga: Volume 5, Author Guide.


  1. In the anime, the three pins on her hair is reduced to two.

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