Nanami was born in Fujieda on November 28, 1972. After graduating from Juntendo University, he joined Júbilo Iwata in 1995. From first season, he played as regular player and became a most central player in golden era in club history. The club won the champions 1997 J1 League and 1998 J.League Cup. He was also selected Best Eleven for 3 years in a row (1996-1998). In Asia, the club won 1998–99 Asian Club Championship. In July 1999, he moved to Serie A club Venezia on loan. However the club was relegated to Serie B in 2000. In September 2000, he returned to Júbilo Iwata. He hurts his knees in 2001 and he reduced opportunities to play in the match after that. The club won the champions at 2002 J1 League and 2003 Emperor's Cup. This was golden era in the club history and he was one of the central player in golden era. In 2006, his opportunity to play decreased and he moved to Cerezo Osaka in August 2006. In 2007, he moved to J2 League club Tokyo Verdy. In 2008, he returned to Júbilo Iwata and announced his retirement in November 2008 after being dogged by a knee injury in recent years.