Shinsuke's early history is obscure, and a possible connection to Wada Koremasa has been suggested but never proven. He first served as a chief retainer of Oda Nobukiyo, a cousin of Oda Nobunaga, and was present for Nobunaga's struggle to subdue all of Owari province at the expense of a rival branch of the Oda. Nobukiyo and Nobunaga feuded in 1562, with the former fleeing to Mino province. Shinsuke submitted to Nobunaga in the wake of this upset and became a retainer of the latter. He was killed in the fighting at Nagashima in Ise province in 1574.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005