大塚製藥
Doi was born in Naruto on April 2, 1972. After graduating from University of Tsukuba, he joined Japan Football League (JFL) club Otsuka Pharmaceutical based in his local in 1995. He played many matches from first season. In 1997, he moved to JFL club Kawasaki Frontale. He played many matches as defensive midfielder and the club was promoted to new league J2 League from 1999. In 1999, the club won the champions and was promoted to J1 League from 2000. However he could not play many matches and the club was relegated to J2 in a year. In 2002, he moved to Japan Football League club Otsuka Pharmaceutical and he retired end of 2002 season.