He was a first-grade jujutsu sorcerer and an underclassman of Satoru Gojo and Suguru Geto. After graduating from Tokyo Jujutsu High, he left the profession to work as a salaryman but returned four years later after finding no fulfillment in corporate life. Known for his calm, pragmatic mindset and strong disdain for overtime, Nanami later became a mentor to Yuji Itadori. During the Shibuya Incident, he continued fighting despite severe injuries and was ultimately killed by Mahito.