He is the king of Earth and the father of Ui and Kiyoko. Through surgery he maintains an eternally youthful appearance.

Kyoko Suomi is the princess of Earth in the 30th century. Kyoko lives among the commoners, unwilling to reveal her true identity and ascend the throne. The king will allow Kyoko to live as she pleases if she can revive her twin sister Ui, who has been trapped in time since birth.
 
(Source: Viz Media)
 
Note: Includes three bonus chapters.

Preparing a party for her anniversary with the King, when he failed to show up Chocola decided to run away from the castle.