 He was adopted by his elder brother Manabe Akifusa as heir in 1708, and was received in formal audience by Shōgun Tokugawa Tsunayoshi the same year.In 1720, became "daimyō" on his brother's death .The same year, he was transferred from Murakami to the newly-created domain of Sabae by ShōgunTokugawa Yoshimune as part of the purge of the Manabe clan due to then influence it had over his predecessors Tokugawa Ienobu and Tokugawa Ietsugu.