Kuroko and the Labyrinth of Magic

When a Magi dies, they are reborn. Aomine Daiki, a chosen king who became corrupt, killed his Magi, and falls into despair. Kagami Taiga meets a mysterious boy with amnesia named Kuroko Tetsuya, who seems to have supernatural powers. After saving the boy from slave traders, they both agree to travel together, and meet friends along the way. Warning: Rape in first chapter.