Endride

Shun Asanaga is a 15-year-old junior high school student with an optimistic and bright personality. One day, he discovers a mysterious crystal in his father's office. His father is both a scientist and a businessman. When Shun touches the crystal, the world becomes distorted, and he is transported to the world of Endra. Emilio, the prince of the kingdom of Endra, is nearing his 16th birthday and harbors resentment toward the reigning king, Delzain. As Emilio reaches the age where he can inherit the throne, he takes up a weapon and attempts to seek revenge. However, due to his weakness, he is captured by Delzain and imprisoned. While Emilio is in despair, the wall of his cell becomes distorted, and Shun appears from there with two objectives: to return to his own world and to help Emilio complete his revenge. What future awaits the two boys, who are trying to survive in Endra but were raised in entirely different worlds?