Maybe a Fake Gintama - Chapter 32: Be Sure to Prepare a Good Speech Before the Competition!

A great demon king who came from another world to conquer Earth. To save the Earth, Li Luyou could only first take care of this great demon king… a little girl proclaiming herself Her Imperial Princess.

- Description from Novelupdates

You are the ruler, I am a subject, you want loyalty, I’ll give you loyalty. You are the ruler, I am the subject, you want my sacrifice, I will sacrifice for you. This lifetime, we’ll only be ruler and subject…… cannot become the one who accompanies you to experience everything.

A deposed empress, a failure of a substitute. Charging into battle, he was the emperor, and she, his general. But within the intimacy of their military tent, he was her husband, and she, his wife.

But everything was star-crossed. For the one he loved the most, he would push her into hell again and again.

- Description from Novelupdates

Cross is a laborer and helper working in multiple construction sites and stores to pay his bills and food. The pay isn’t much, but he is content with his life. He has a job, a crappy rented apartment, and a girlfriend.

But it all shatters when the world changes one day. A strange phenomenon teleports everyone into a world of fantasy, magic, dangerous beasts, and mystifying creatures.

Everyone is given abilities, skills, and spells and can level up like in a game.

And that’s not all. They are transported in a medieval timeline where technology is nonexistent, and living is harsher than one might expect!

When Cross swipes his hand, a screen appears, and the first thing he read.

‖ E V I L S Y S T E M

S I D E Q U E S T ‖

* Insult Someone

Reward:

+100 EXP

* Spank a girl’s butt

Reward:

+1,000 EXP

‖ E N D ‖

‖ E V I L S Y S T E M

M A I N Q U E S T ‖

* Brake up with your girlfriend

Rewards:

+10,000 EXP

Egg (?)

Min's system, System #151044, is tired of watching him get girls and make dumb decisions yet still manage to defeat the villain. If only he was the villain, there's no way Min would win.

His wish was granted. He now upgraded from a bodyless helper system to the evil villain, Ronin Dreadborne!

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After getting murdered and reincarnating as a system inside a Hero Transmigrating Machine, System #151044 spent thousands of years wondering why he had such a cruel fate to be a system for incompetent transmigrators like this.

But the worst is Min Cheng............

Because Min Cheng spends all his Hero points on girls instead of leveling up! And he is the dumbest transmigrators he ever met!

But through a rogue system that gave them a code to free themselves from their roles as a system, System #151044 was able to transform into Min Cheng's enemy on the next world, Ronin Dreadborne, in a mage fantasy world!

[Fate itself is evil. The only true enemy is fate, and I have defeated it.]

[And I shall teach you how to defeat it too. I will be giving you the gift of freedom. ]

[Be the master of your fate like you were always meant to be. And conquer those who try to stand in your way.]

That is exactly what he did as Ronin, and to defeat an evil fate, you have to be evil yourself!

“I will be the best villain in all the dimensions! Watch out, Min Cheng! I'm coming for you!”