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Katai Tayama (田山 花袋, Tayama Katai?) is an information broker. He is a former member of the Armed Detective Agency. He has the ability named Futon.


Katai has black hair and wears small circular glasses and is often found resting in his futon within the comfort of his home. His attire consists of a white button-up shirt, a patterned robe over his shoulders, and dark pants.


He is an anxious, nervous, easily stressed out and unmotivated man, who lies in his futon all day, refusing to go outside or communicate with others. Because of this, Kunikida described him as a hikikomori for reclusively shutting himself at home for extended periods of time, isolating himself from society.


Main article: Futon

His ability, Futon (蒲団 Futon?), allows him to manipulate electrical signals which he can use to control any electronics within sight. His ability also enables him to process information dozens of times faster than an average human.

Additionally, it seems that Katai can only concentrate wherever his body and mind are most relaxed. Although Kunikida mentioned that he can only activate his ability when he’s wrapped in his futon, Katai has shown to be able to use his ability and change the signal of a pedestrian traffic light even without it.

Futon (蒲団 Futon?)
Futon.gif Manga Debut: Chapter 41
Anime Debut: Episode 30
Ability: Electrical Signal Manipulation


Katai and Kunikida first met each other 10 years ago. According to Kunikida, when Katai was dragged out of his room to join the Agency, he laid out a futon in his office and began living there and even locked himself in his room to avoid going out.


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


  • The name Katai means "flower" (花) (hana/ka) and "sack" (袋) (tai).
  • The surname Tayama means "rice field" (田) (ta) and "mountain" (山) (yama).


Main article: Real-life References#Katai Tayama
Katai Tayama (January 22, 1872 - May 13, 1930)
TayamaRL Thumbnail.png
Born into a samurai family, Tayama later moved to Tokyo and began his journey as an aspiring writer, rubbing elbows with the likes of Kōyō Ozaki and Doppo Kunikida. His works paved the way for Japanese auto-biographical I-novels and were inspired by his turbulent love relationships, his main work "Futon" detailing a middle-aged author's attraction toward a younger student. [3]



  1. Bungo Stray Dogs Manga: Chapter 52.
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Bungo Stray Dogs Manga: Volume 15.
  3. Bungo Stray Dogs Manga: Volume 12, Author Guide.

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