When the world is covered by endless silver gray, and when the surface turns into a sea of nano-metal that is constantly crawling, the arrival of the "grey goo" plays the final funeral song for human civilization. The survivors huddled in a small area called the "Island of Silence". Under the protection of the nano-suppression field, they lingered, looking up in despair at the silver sky that had swallowed up the past.
However, for Zero, a young man who was pushed into a desperate situation and thrown into the Nano Sea as a discarded "experimental subject", this doomsday sweeping the world unexpectedly became the bloody staircase for him to be crowned king. A higher-authority "commander-level" nanoswarm awakened in his body. He was not devoured, but instead became the sole will of this endless ocean, the supreme [King].
His arm instantly turned into a high-frequency blade that ripped apart everything. His flesh and blood body resisted the gunfire and was reborn unscathed. He turned "flesh and blood are weak and the machine soars" into his daily life. He is the army, and the ground under his feet is his weapon. He can raise city walls, build palaces, or turn them into death traps that strangle everything at will. He devoured old-era weapons in the ruins, analyzed their structures, and "printed" more ferocious and deadly firepower on his body.
In this gray doomsday, the gods are long dead.
Now, it is his turn as a "tyrant" to redefine "natural disaster".
