Stranger's Handbook - Chapter 41: She Came!?

Perhaps it is the choice of fate. As a senior otaku, Qian Lingfeng got the “steel shell system”. However, when he swept the world with the system, became a local rich man, made all kinds of beautiful women, opened a harem, and realized the ultimate fantasy of thousands of otaku, he found that things seemed far from simple!
When the end comes, biochemical zombies suddenly come down, fierce beasts are in power, bloodthirsty zerg roam to kill the world, and human lives are comparable to dirt. Where will weak human beings go in this world? Is humanity going to be extinct? Or … can an otaku save the fate of the human race?

- Description from Novelupdates

The world is terrorized by the powerful Black Witch who has been sealed in the moon. Every ten years, the night of Hexennacht arrives and a chosen witch must battle the Black Witch in hopes of finally defeating her.

As the current decade’s Hexennacht approaches, a mysterious girl named Kagami Kagami arrives and meets Horinouchi Mitsuru, the daughter of the previous Hexennacht representative.

It takes place between Kyoukai Senjou no Horizon and the City Series, two other series by the author.

His filming opportunities were taken by others, his boyfriend cheated on him, he gave up a rich, tall handsome fiance and devoted himself to a scumbag. In the end, he was beaten to death by the scumbag. Yan Qing Chi felt that although this danmei cannon fodder supporting male that he transmigrated into was troublesome, it was kind of tragic that he died like this through his own actions.

So, the first thing that Yan Qing Chi did after taking over this body was to catch them in the act and beat up the scumbag! The second thing that he did, was to agree to the marriage proposal from the aristocratic fiance.

However, Yan Qing Chi stared down at his big belly. Who can tell him what the heck this was?! Don’t tell him that he transmigrated into a mpreg novel???

Standing on the side, tall, rich, and handsome Film Emperor Jiang asked carefully, “Babe, do you want a boy or a girl?”

Yan Qing Chi: Do I want a WHAT?!

- Description from Novelupdates

“I was created to rule the stars. Instead, I was sealed away and forgotten. Now, it is time for those who sealed me to fear me once more.”__Born of futuristic technology, as well as a part of a god’s powers, Nova was the ultimate life form made by the richest couple in the universe to take over their empire. But due to seeds of betrayal, he was not only sealed away before he could awaken his potential, but everything that was his was also stolen by those thieves.Hundred years later, Nova wakes up when his mother ship gets raided and his pot is extracted to be sold. He awakens with a vengeance, and a mission to reclaim everything that was promised to him.This is his story of conquest, revenge and to tell the world that he is back. And this time, he won’t let anyone else take anything away from him.A hundred years might have passed, but his vengeance still burns bright.__r18 is mainly gore...and MC's tendencies. You have been warned. Harem and Romance will be slow since the MC has other priorities in life.. No Yuri, no NTR. But there will be a lot of catfighting between female characters for MC's attention.