The Houseki Kingdom (宝石王国 Hōseki Ōkoku?, lit. Jewel Kingdom) is a kingdom existing in the Guardian Angels Of The Sky Series. The Houseki Kingdom is known as the kingdom of five lights and is protected by the five rainbow jewels that hold mythical powers. The kingdom debuts in Guardian Angels Of The Stars: Legend of the Rainbow Jewels, where the kingdom is under attack of the light of sorrow.
- Much like the Skyriver, the Houseki Kingdom used to have legendary warriors.