In 1991, Wada and his family moved to Izumo, Shimane Prefecture, Wada's father's hometown. Wada enrolled in Shimane Prefectural Hamada High School in Hamada upon graduating from junior high, leading them to the 79th National High School Baseball Championship in the summer of his second year of high school (the equivalent of eleventh grade in the United States) in 1997. His team faced Akita Commercial High School, led by current Tokyo Yakult Swallows ace Masanori Ishikawa, in the first round, but Wada walked that very Ishikawa with the bases loaded in the bottom of the ninth inning and suffered a walk-off loss.