You live in the Palace of Earth Spirits, a mansion located in the Underworld. It's nice to live there: it's not loud, the neighbors are quiet, it's very good. But you don't live alone, you live with your daughters Satori and Koishi Komeiji, two girls who are awesome. Satori is intelligent and she knows how to read minds, and Koshi... well, she's just Koishi.

One day, you were cleaning the mansion while Koishi was on the couch. She was sitting upside down and giggling.

Koishi: "Look, look! If I get upside down, the world also gets upside down. Does that mean the world is my best friend now? Am I best friend of the Earth? Can I be a planet?" She giggled again as she swung her legs.