One Piece: Unreal Adventure - Chapter 27: No More Plateau

One day every human on the world suddenly receives a mail claiming to enact the World Salvation Project. Half in doubt Kurosaki Shion, a diligent university student and loner, follows the mail’s instructions, becoming one of a million Demon Kings governing his very own Domain in the new world.

*** This is a post-apocalyptic story containing many fantasy elements. It is a somewhat dark tale following Shion as he grows while aiming for the unification of the all too sudden new world. It has many game-elements bolstered by strategical thinking while at the same time providing funny moments and romantic encounters.

WARNING! MATURE CONTENT!

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How do you celebrate Valentine’s Day?

Maybe you will answer that you are going to confess your feelings to someone while saying: “Be my valentine?”

It was a common thing, but Bai Chen had another idea for celebrating Valentine’s Day. He already had a girlfriend who was beautiful, intelligent, and kind, but on Valentine’s Day, he wanted to make his girlfriend his valentine in a different way.

Having lived for more than two decades but still a virgin, Bai Chen wanted to end his virginity today as a way to make his girlfriend his valentine.

He was very enthusiastic about it, but who would have thought that his heart wasn’t strong enough to stand his enthusiasm until he finally got a heart attack when he was only one step away from making his girlfriend his valentine?

And what was even worse, not only did Bai Chen fail to make his girlfriend his valentine, but he was also transmigrated to a world completely different from his world.

He transmigrated into another world and became a Werewolf Prince, and as if that wasn’t bad enough, he became a gay Werewolf Prince.

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“How can I be gay? I’m as straight as a metal pipe, and I will only break but never bend!”

“Are you sure about that? But metals are ductile and malleable, and they can be shaped, bent, or manipulated without breaking.”

Roy’s life was nothing special. The only thing commendable was the last few moments when he saved a mother and her child from a drunk driver.
…
It’s really an egg! Damn it, what kind of monster have I become? Did I fall into Hell instead of making it to Heaven??
Join Roy as he ventures through various worlds with the Custom Made Demon King System—a system that allows Roy to draw anything he can imagine and create it through exchanging souls!

After a vacation, when she returned to her country she caught her fiancé cheating. She angrily left and disappeared.

Five years later she returned with her talented kid. Afterwards, her son participated in the piano competition. Unexpectedly her son actually came looking for his father.

“The camera on this side, take me to take a look! My name is Xiaoxi my mommy is called Tang Siyu and she’s very pretty! I’m four and a half years old this year. I’m looking for my father, you probably look like me, please be sure to contact me, oh!”

After that, he was gone from the front of the camera again and said, “Oh, I’ll wait for you!”

In the background, a woman became mad. A few days later, a mysterious man came to their doorstep and claimed to be Little Xi’s father.

Tang Siyu looked at this tall and handsome man, who her son was a carbon copy of, and then became angry.

Five years ago, the bastard who pinned her down was him?

- Description from Novelupdates