Reikai

is a sealed underground world or dimension in which resides the very first sages who founded the and all the spirits who were saved by those sages from the wrath of Kaguya Ōtsutsuki in her era.

Kingdom
In Reikai, 7 family members of the first sages who were those survived from Kaguya's Infinite Tsukuyomi are the ones who rule this world. With the highest hierarchy of the kingdom, King Shenron and Queen Shura, the world has been lived peacefully ever since the era of Kaguya. The king and the queen's 5 children are also ones of the highest committees in the kingdom.