Endra is an unknown world beneath the surface of Earth, where the giant Adamas shines above, and seven-coloured bands drift across the skies. One day, Asanaga Shun, an ordinary yet positive and bright 15-year-old middle school boy who lives in the Land Above, discovers a mysterious crystal at his scientific businessman father's company, and the moment he touches the crystal, he is transported to Endra. There, he meets the recently captured 16-year-old prince Emilio, who strongly despises the current king, Deruzain, and was imprisoned after seeking vengeance against the monarch. Source: ANN