Lagrange: Rebuilding the Sacred Star Empire

[Battleships and big guns + racial purity obsession + human supremacy + glassing]

A second life.

Born into an ordinary, old-fashioned family in the Third Human Federation's Interstellar Republic.

Forced by circumstance to sign the Pioneer Exploration Program,

he assumes that boarding a pioneering ship means certain death.

But then he obtains the Lagrange game he played in his previous life, along with every blueprint he had back then.

Well, then...

Federation, alien races! My fleet blots out the sky. Are you ready for the reckoning?

(Early on, he captures and raids corporations and snatches Federation scientists and researchers to refit the ships from Lagrange, fixing the mismatch between their tonnage and weaponry.

This is not a completely faithful Lagrange galaxy; the setting is inspired by it.)