Nukui Fusasada served as a bushō during the Sengoku period.  He was a retainer of the Noto-Hatakeyama clan.  After entering the priesthood, he adopted the name of Nukui Jōshun.  Fusasada was the head of the Hatakeyama Group of Seven.  He served as lord of Tendō Castle in Noto Province.

The Nukui clan originated from Fujiwara-no-Toshihito, a noble and bushō from the early Heian period in the tenth century affiliated with the Uona branch of the Fujiwara-Hokke lineage.  The Nukui were a kokujin, or provincial family of influence, in Noto.

Fusasada served three generations of the Hatakeyama clan, including Yoshifusa, Yoshitsugu, and Yoshitsuna.  He received one of the characters in his name from Yoshifusa, the first head of the Hatakeyama clan that he served.  Well-versed in arts and literature, Fusasada was admired by Yoshifusa and served as the most senior retainer in the family.  In 1534, he received the court titles of Assistant Director of the Bureau of Military Storehouses and, in 1545, Governor of Bitchū.  In the era of Yoshitsugu and Yoshitsuna, he began to act autocratically.  Around the time that he became the head of the Hatakeyama Group of Seven, he kicked down Yusa Tsugumitsu, the head of the Yusa clan, and wielded his authority with abandon.

In 1555, Fusasada was assassinated by his lord, Hatakeyama Yoshitsuna, and a close retainer named Igawa Yoshimune, in a bid to restore their authority.  After this incident, Fusasada’s son (Tsugumune) and grandson (Kagetaka) fled to Kaga Province.