A young computer wiz dies in a car accident but gets a second chance when he reincarnates in a fantastical world full of actual, workable giant robots like the fictional ones he adored in his previous life.

Ernesti jumps into a Silhouette Knight, intending to fight the beast headed for the capital, but can't fully control the mech due to his short stature.

When asked to name his reward for defeating the behemoth, Ernesti asks for the Silhouette Knight's blueprints, and the king grants the request on one challenging condition.

Ernesti deals with roadblocks in the construction of his first mech, the Telestale; an influential lord named Marquis Dixgard takes an interest in Ernesti's work.

Raiders hit the convoy of new mechs being transported to Marquis Dixgard, using beasts to do their dirty work.

Ernesti turns his attention back to the Telestale as the researchers in Fremmevilla Kingdom attempt to reverse engineer Ernesti's designs to create their own improved model of mech.