The first Tokyo Marathon was held on 18 February 2007. However, years prior to 2007, Tokyo Marathon actually consisted of two marathons -  the Tokyo International Marathon which took place on even years, and Tokyo - New York Friendship International Marathon which took place on odd years.
The first Tokyo Marathon was organized in 2007. Before this date, the Tokyo Marathon featured two distinct races: the Tokyo International Marathon occurring annually on even years and the Tokyo-New York Friendship International Marathon held every odd year.