Twenty-two years ago, a mysterious seismic event shook the Yokohama district, lifting it miles into the sky and effectively isolating it from the rest of Japan. In the years that followed, a small number of newborns in this emerging world began to develop extraordinary abilities, each unique to the individual possessing them. These mutated humans came to be known as Alters and were responsible for transforming the former Yokohama into a chaotic wasteland. Now, as the former metropolis continues to rebuild, the Alters have split into two factions: those who have joined HOLY, a dogmatic organization aiming to restore order and morality, and those who seek to dominate the comparatively weaker humans. Only Kazuma, a powerful Alter primarily concerned with looking out for himself and an orphan girl named Kanami, stands between them. He is suspicious of both sides and unaware that he may hold the key to harmonious coexistence.