Naruto: I Can Take People Through the Ninja World in the Future - Chapter 8: I am to Blame!

There is an ugly beast that violates women in prison.

A treacherous beast that is feared and called a “Butcher”.

That’s me.

I was once a human but now I can’t even remember my own name.

I can’t speak, and I don’t understand a word they say.

It is in this deep loneliness that I am pouring my essence into the women everyday.

I pour my burning rage into them.

Over and over again, until they conceive.

From morning till night. Until the women’s souls withered.

To show them that I’m an excellent stallion and an obedient domestic animal.

But my soul has not perished yet.

I will break free from this prison soon. And when I do, it will be your last.

Every human who betrayed me, every demon who altered me, I will trample down like an ant.

And it won’t stop until I’m satisfied.

The dawn of the beast is near.

“There are no heroes. In life, the monsters win.”

...

In 2106, [Mayhem Online], a fully immersive VRMMO game, was released. Soon, it dominated the world's economy when people could exchange the in-game currency with real-life currency and vice versa.

In the year 2107, Flynn Grey, a 22-year-old college dropout with an ambiguous history, joined in the fray of billions of people that had already started playing [Mayhem]. Hoping to uncover the game's secret and earn a fortune, he spent months on adventures without fruitful results.

For better or worse, Shura, Flynn's in-game character, ends up in a great Wyvern's den, acquiring a hidden class and a monstrous race. Join him as he defeats his past and paves his way into becoming a true legend in both worlds.

Xiao Ze, who was dedicated to the people and vowed to become a generation of Ming Jun, accidentally fell on a little lady.
The little lady was born beautiful and lovable.
So Xiao Ze accepted his life and got the name of fear.

ps:
①The male protagonist has no concubine, and he is dedicated to serving the country.

- Description from novelbuddy

Jerry traversed across worlds and arrived in a Beast Summoning era. In this world, everyone could summon their own pets. Darkness was looming, and the world was in turmoil. Relying on the power of their summons, many shrines plundered the resources at every corner of the world like tyrants. But when everyone else was summoning adorable pets that could help them in battle, Jerry discovered that his summoned pets were a little different. Other people's pets are all kinds of beasts, but Jerry summoned gods from Greek mythology! King of the Gods, Zeus, “Master! I, Zeus, is at your command!” Athena, “I will fulfil all your requests, master!” Poseidon, “I will conquer this sea in the name of the master!” In constant summons, step after step, Jerry became the supreme ruler of this world!