One day, Earth was transformed into another world. Unknown continents floated in the sky, labyrinths opened their mouths on the ocean floor, and dungeons were born beneath forests and cities. The "System" appeared in people's vision, and the concepts of jobs, skills, and levels became reality.

National governments and the United Nations established the System Agency, authorized explorer guilds, and developed systems for dungeon management and job awakening. Then, 100 heroes with overwhelming power officially recognized by the government—the Rankers—appeared. As humanity's hope, they quelled monster disasters, confronted the threats of the dark continents, and became the center of a new world order.

Currently, Earth is gradually regaining stability. Asia including Japan, America, Europe, and India have built stable zones, creating societies where magic and science coexist. But southern Africa, Australia, and the Antarctic continent—the Abyss—remain beyond humanity's reach. Amid such turbulent times, you awaken. Whether by reincarnation, living as a monster, or any other way of life, proceed freely as you wish.