Michiki was born in Nagasaki Prefecture on August 25, 1973. After graduating from Kunimi High School, he joined Sanfrecce Hiroshima in 1992. He mainly played as left side-back. The club won the 2nd place at 1995 and 1996 Emperor's Cup. Although he moved to Yokohama Marinos (later "Yokohama F. Marinos") in 1998, his opportunity to play decreased. He moved to Urawa Reds in 1999. In 2003, although he moved to Vissel Kobe in January, he resigned in February. Although he signed with Oita Trinita in April, he resigned in June.