 In 1999, at the age of 23, Saitō formed a comedy duo called Abare Nunchaku with fellow up-and-coming comedian Kosuke Takeuchi.This marked his official debut in the Japanese mainstream as Abare Nunchaku had some success until disintegrating in 2005.Following the disbandment of Abare Nunchaku, Saitō went on to make his singing debut in 2006 on the television show "Quiz $ Millionaire".