Kaido Santōshi (灰土散闘士 Scattered Champion of Ashen Land) is a University Student who resides in Osaka and is a medical student at Osaka University. He is currently studying Optometry, and because of the fees, has also taken up full time work as a Bartender within Sanshō Izakaya, where he is rather popular as one of the only staff. Unknown to him, Kaido is the reincarnation of Kyōzen Chōkaido, and is the main male protagonist of Bleach: Kayokuhai.