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The Kuroba (黒羽, くろば, lit. black feather) Family is a branch family of the Yotsuba Clan


They are the branch family responsible for the supervision and gathering of intelligence for the Yotsuba. [1]

Kuroba Fumiya, the eldest son of the Kuroba, had been the number two candidate in-line for succession of the Yotsuba Clan. [2] He relinquished this position in favor of his cousin Shiba Miyuki, for which his entire family was in agreement. [3]

Kuroba Mitsugu's wife, Shinonome Aya, is stated to have died young. This attributes to why he dotes on his children. [4]

All of the agents the Kuroba employ, use 'Poisoned Bees' as their trump card; a Sensory Systematic Type Magic that increases a target’s pain perception infinitely until death. The greatest advantage to “Poisoned Bees” is its ability to finish an opponent with the tiny prick of a pin, leaving behind a nondescript wound that would be hard to link as the cause of death. [5]

Yotsuba Maya had made the Kuroba disseminate information about themselves in order to start a rumor. [6] Then, during the AD 2096 Nine Schools Competition, the rumor going around since spring that the Kuroba had spread, was that they were a Branch Family of the Yotsuba. This is mentioned by Yoshida Mikihiko to Tatsuya. [7]

Main House

The Kuroba live in Hamamatsu, Shizuoka. [4][8]

Near the Yotsuba Main House, there is a complex where the Kuroba Twins' grandmother, Yotsuba Yume, the little sister of Tatsuya and Miyuki’s deceased grandfather, Yotsuba Genzou, as well as aunt to the current family head, Maya lives. [2]

Area of Influence

The Yotsuba Clan's influence encompasses specifically the Tōkai region and both the Gifu and Nagano prefectures. [9]


Grandparents Generation

  • Kuroba Juuzou (黒羽 重蔵) - (Former House Head, Deceased)
  • Yotsuba Yume (四葉 夢女)

Parents Generation

Candidate Generation

  • Kuroba Ayako (黒羽 亜夜子)
  • Kuroba Fumiya (黒羽 文弥) - (Forrmer Candidate - Withdrew Before Announcement of Heir)


  • As with all of the Yotsuba Branch Families, the family name is either derived from a variation of Yotsuba, or the name of a flower having four leaves. [10]


  1. Volume 8, Untouchable - The Nightmare of 2062
  2. 2.0 2.1 Volume 8, Chapter 3
  3. Volume 16, Chapter 6
  4. 4.0 4.1 Volume 8, Chapter 4
  5. Volume 10, Chapter 9
  6. Kuroba Twin story, Drawing attention mission
  7. Volume 13, Chapter 5
  8. Volume 12, Chapter 9
  9. Volume 17, Chapter 5
  10. Volume 15, Afterwords

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