Chan Sai (サイが歌った,Chan Sai) or otherwise known as the Dao (刀, Dao?) was a vice-jailer on Kangoku Island but after the defeat and take over by the Itsubetasijo he had and the rest of the prison staff have been forced to be the security and the military force of Kangoku Island. Now Chan Sai along with his brother Chan Rai is members of the Kangoku guardians, Chan Sai being the 4th division leader and his brother the 3rd division leader. Originally Chan Sai and his brother were the body guards of Chief Toad Cho Cho during their days as bandits and was second-in-command of the group. However after Cho Cho was given his under the table deal and became the warden of Kangoku prison vice-jailers.