On the unknown world of Endra, hidden beneath the surface of Earth itself, a tale unfolds. The sky is adorned with seven-colored bands and the giant Adamas casts a radiant glow from above. It is here that Shun Asanaga, a normal 15-year-old boy from the Land Above, found himself after discovering a mysterious crystal at his father's company. Upon arrival, Shun encounters Prince Emirio, who is poised to take over the throne from the current king, Deruzain. Emirio despises Deruzain and has spent his life seeking vengeance against him. However, he is outmatched in strength and is soon captured and thrown in a cell. Amid these dire circumstances, the walls of Emirio's prison begin to warp and Shun appears before him. Together, they must navigate their divergent worlds and confront their respective challenges. Will they find a way to fulfill their goals, or will their hopes remain out of reach? The future of two youths from different realms hangs in the balance.