was a samurai and retainer of the Ōuchi clan and a son of Sagara Masato.

Originally from Higo province

Higo Province

Higo Province was an old province of Japan in the area that is today Kumamoto Prefecture on the island of Kyūshū. It was sometimes called , with Hizen Province. Higo bordered on Chikugo, Bungo, Hyūga, Ōsumi, and Satsuma Provinces....

, he served the Ōuchi clan as his father had become a retainer of the clan. From around 1543 with the support of Ōuchi Yoshitaka

Ouchi Yoshitaka

was a daimyo of Suo province and a son of Ōuchi Yoshioki.In 1522, he fought the Amago clan along with his father, Yoshioki, to win the control of Aki province. Upon Yoshioki's death in 1528, Yoshitaka became the head of Ōuchi clan. In the 1530s, he led a military actions in the northern Kyūshū,...

, he led a faction of retainers who preached a softer approach, as opposed to the faction led by Sue Harukata

Sue Harukata

was a retainer of the Ōuchi clan in the Sengoku period in Japan. Harukata would later become a daimyo. He was the second son of Sue Okifusa, senior retainer of the Ōuchi clan. His childhood name was Goro. Before Harukata he had the name of Takafusa...

, which preached a hard-line stance. One of the reasons for the internal feud of the Ōuchi clan was a result of Taketo and Harukata arguing over the future course of the clan. In 1550, facing an impending clash with Harukata, he tried to flee to Chikuzen province

Chikuzen Province

was an old province of Japan in the area that is today part of Fukuoka Prefecture in Kyūshū. It was sometimes called , with Chikugo Province. Chikuzen bordered Buzen, Bungo, Chikugo, and Hizen Provinces....

, but was captured and placed under house arrest. Taketo tried to appease Harukata by having his daughter marry Harukata's son, but the relationship remained cold.

In 1551, Harukata revolted and Taketo was killed in Hanao Castle.