In Buddhist mythology, Takeji Zaiten ([//en.wikipedia.org/wiki/ 他化自在天]) or Takejizaitenjin (他化自在天神) is the alternative name of Dairokutenmaou. The name comes straight from the highest realm of the "Six Lust Realms", or known as [//en.wikipedia.org/wiki/ Kamaloka], where the demon lord resides in. Its name means "having pleasure from watching over other living things change". One day-night cycle in this realm is 1600 years of the mundane world, while the Maou lives in this realm for 16000 years and then reincarnates.