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|Spoiler Alert: This page contains spoilers. Read at your own risk.|
Yuuki Fuyuhiko died during the war with Dahan in 2062. 
Tsukuba Yuuka, the eldest daughter of the Tsukuba Family stated that her family had decided to quit trying to make her the next head of the Yotsuba Family and decided to continue keeping her as a candidate in order to maintain some leeway while favoring Shiba Miyuki. 
Later on she speaks honestly about the Tsukuba Family wanting to have a quick track record of supporting the next Family Head, due in part to the Tsukuba falling behind the Kuroba and Shibata in terms of blood ability. 
The Tsukuba Family uses a building annex that is connected to the Yotsuba Main House. 
Area of InfluenceEdit
- Yuuki Fuyuhiko (結城 冬彦) - (Deceased)
- Tsukuba Ayaka (津久葉 彩歌) - (Former House Head)
- Andou Seiji (安東 青司)
- Tsukuba Touka (津久葉 冬歌) - (Current House Head)
- Tsukuba Yuuka (津久葉 夕歌) - (Candidate)
- 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.