Jūami served as a chabōzu during the Sengoku period on behalf of Oda Nobunaga, the deputy military governor of Owari Province. In this role, Jūami served tea and meals, received and entertained guests, and performed associated tasks. The individuals performing these roles on behalf of the shōgun were referred to as the dōbōshū.
Jūami originated from a powerful local clan known as the Aichi, a grandchild of Aichi Yoshinari (a bushō during the latter Heian period and early Kamakura period). Although Jūami served Nobunaga, he frequently displayed an arrogant demeanor toward the bushō under Nobunaga. Nobunaga reached his limit after Jūami engaged in repeated acts of insolence, including the theft of a hairpin from Maeda Toshiie who was known as a kabukimono during his youth, later rising through the ranks to become a senior retainer. Toshiie had received it from his formal wife, Matsu, which was a keepsake from her father. In 1559, Toshiie slayed Jūami with a sword by Toshiie right in front of Nobunaga. As a result, Nobunaga ordered a halt to Toshiie’s services, whereupon Toshiie temporarily became the equivalent of a rōnin, or masterless samurai. Toshiie was later pardoned owing to his contributions at the Battle of Okehazama and the Battle of Moribe.