Nobunari was the eldest son of Wada Narishige (d.1575). He held Wada castle in Kôzuke and at first served the Yamanouchi-Uesugi. He became a vassal of Takeda Shingen in 1560 and went on to serve Shingen's son Katsuyori, fighting at the Battle of Nagashino in 1575 (where Nobunari's father was killed). After the fall of the Takeda in 1582, he came under the authority of Oda general Takigawa Kazumasu. When Kazumasau was driven from Kôzuke by the Hôjô soon afterwards, Nobunari gave his loyalty to the latter. In 1590, Toyotomi Hideyoshi's armies invaded the Hôjô domain and Wada castle was captured. Nobunari fled and dropped out of sight.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005