◆Volume 1 now available from KADOKAWA Enterbrain's paperback series! Volume 2 in production!

There is only one way to avert the coming great war and destruction.

Empower the protagonist with overwhelming cutting-edge technology to dominate the situation and save the villainess princess.

Grim Phillion, a boy from the defeated nation of Walesland, realized at the age of five that this world was 'Gear x Magic', a game he was obsessed with in his previous life.

It was a world where industry and magic had developed amidst a fierce struggle for survival against half-mechanical, half-human monsters called 'Gargoyles'. Magic-powered armor called 'Gear', developed to counter the Gargoyles, changed the scale of warfare, and the massive Gaina Empire boasted immense power.

Grim realizes that in the future, humanity will face ruin due to the collapse of the Gaina Empire.

To prevent the Gaina Empire prince's rebellion, which triggers this collapse, Grim decides to change the story's plot.

It all begins with the death of the Second Princess.

To avert her death, it is necessary to significantly enhance the performance of the 'Gear'.

Grim, leveraging his 'Gear x Magic' knowledge, rises as an engineer and devises a plan to significantly upgrade Second Princess Rouge's Gear.

Despite facing discrimination from the imperial citizens, Grim's genius maintenance skills earn him the trust of the garrison soldiers, who even entrust him with the maintenance of their 'Gears'.

Eventually, his power will be unleashed in large-scale battles.