[1] Nagano was born in the Kumamoto Prefecture and as a child honed his skills at a driving range built on his grandfather's ranch.

He represented Ibaraki Prefecture at the 62nd National Athletic Meet golf competition, and won the adult men's section and team.

[3] He won a bronze medal with Yuta Ikeda, Yuki Usami and Daisuke Yasumoto at the 2007 Summer Universiade in Bangkok.

He bogeyed the final hole to enter a playoff at the 2021 Panasonic Open Golf Championship with world number one ranked amateur Keita Nakajima, which he lost, but could claim the 20 million yen winner's check.

Nagano earned a spot at the 2023 U.S. Open in the Japan qualifying event at Ibaraki Golf Club alongside Gunn Charoenkul and Ryo Ishikawa.