Don Juan transmigrated to the interstellar era and became a poor boy burdened with a huge debt at the start.

In order to survive, they risked their lives to sign up for interstellar exploration.

However, he awakens the Super Interstellar Empire Expansion System and starts by gaining the allegiance of the tactical humanoid mechanical girl race!

It can also assimilate other races!

Good heavens! Don Juan exclaimed, "Good heavens!"

Interstellar Zerg? Assimilate them into mechanical Zerg girls!

A subspace demon? Let's become a mechanical demon girl!

A silicon-based mechanical empire? Pledge allegiance to me, and you too will become a mechanical girl!

A warp god?

Punch Khorne, kick Nurgle, infuriate Tzeentch, Slaanesh... emmmmmmm, better to just leave them behind...

Build an interstellar fleet from scratch! Create a super interstellar empire!