is a former Japanese football player. Playing career Koido was born in Gifu on April 9, 1978. After graduating from University of Tsukuba, he joined J2 League club Mito HollyHock in 2001. He debuted as defender against Kawasaki Frontale on May 3. He played 6 matches in a row from the debut. However he could not play at all in the match after that and retired end of 2001 season. Club statistics References External links 1978 births Living people University of Tsukuba alumni Association football people from Gifu Prefecture Japanese footballers J2 League players Mito HollyHock players Association football defenders