Career
Kaidō went to Meiji Nakano High School where he was a year senior of Tochiazuma. He played baseball and did amateur sumo at Chuo University before making his professional debut in March 1998, at the bottom of the third highest makushita division as a makushita tsukedashi entrant. He initially fought under the shikona of Tanaka, before changing to Kaito and then Kaidō (the character "Kai" being a common one in his stable or heya).
He never made the top makuuchi division, but he spent 11 tournaments in the second highest jūryō division, which he first reached in 2003, reaching a high of jūryō 4.
He was demoted to makushita in May 2005 and never made his way back. He announced his retirement in September 2006.
He had been injury-prone throughout his career, suffering a number of knee injuries, although diabetes was the major factor in his decision.