Planet Kaishin ("World-Core") is the original home planet of all Kai and Kaioshin. The planet is a "large version of a Kai Planet" (something like a larger version of King Kai's planet). The population of Planet Kaishin is roughly 80.
On Planet Kaishin, there are gigantic trees called the Kaiju (World-Tree). These trees sprout beings called Shin-jin from magical fruits. These Shin-jin can possibly take the role of a Kai if incredibly lucky or if born from special golden fruit, in which they then become Kaioshin. The evil Shin-jin born on Planet Kaishin are cast into the Demon Realm located at the very tip of the universe, which is ruled by Makaioshin, to be kept separate from civilization, and they become Makaio.
Note: Most Shin-jin shown in the series were all Kais at the time of their appearances, thus all left their home world ages ago.
- Supreme Kai (Eastern Supreme Kai)
- Southern Supreme Kai
- Western Supreme Kai
- Northern Supreme Kai
- Grand Supreme Kai
- Old Kai