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!

Zeon Declares Independence

Zeon Deploys Colonial Satellites to Earth

Zeon Drops Poison Gas on Colonies

...

Joe Shirota never dreamed he would be transported to the Universal Century (UC) world, and why are there other series of mobile suits in the UC world?

What? You're saying I have a Gundam that looks like a beautiful girl?

Come, come, you lowly creatures, you despicable things, may you all die by my sword!

What the hell is gravity?

(They've been resurrected, children.)

He came to Ainz Ooal Gown's world and became Ainz Ooal Gown's best friend, Peroroncino.

With a max-level account, you can do whatever you want in another world.

What kingdom's vampire princess? I want her.

What kind of princess from the Golden Kingdom is asking me if I want her? What a joke! How can I refuse a princess who's offered to me?

What funny sister? What does "tui" mean?

"Shalltear, what kind of person do you think a pervert is?"

"Just tone it down a bit."

"??????"

Shalltear, what do you think of that red-haired woman in front of you?

"Master, if you like me, go and tie her up and bring her here."

"That voice sounds so familiar."

"Isn't this my sister's teapot?"