The plot is: Several years ago, there's a machine uprising in the world. The machine side wins, the MC is the remaining royal child of Humanity's last kingdom that's completely obliterated by the machine side during those war.
The MC has some mecha hand/glove? as weapon that's powered up by the...
Woah, they cut so many parts from the novel (albeit not critically important, but it still cut some world-building and some monologue, especially from Sheryl) But its still a superb adaptation nonetheless.