Reincarnated With The Undefeated System - Chapter 312 Her Turn. (R18)

In the Tranquil Sun province of the empire, there exists an unremarkable lordship known as Xue Ying Territory! This is the home of the Dong Bo clan, the clan of our hero Xue Ying!

His father, a commoner turned noble; his mother, a noble who abandoned her clan for love, and his brother, an innocent toddler. But peace cannot last forever, Xue Ying’s peaceful life is shattered, and the only way to reclaim it is through power!

- Description from novelupdates

There are a total of seven sins, and a revelation is made to a young man named Alex that he is destined to become a demon lord, more especially a demon lord of sin called LUST.

It's not like he can change that and because he always knew something about himself was different—not in a physical sense, well, maybe a little—and not in a mental sense—but rather because he is thrown into a demonic war that compels him to accept his new reality.

He was only aware of a difference in himself. Relating to him and the ladies who are drawn to him... Well, it was more or less like he was a magnet in front of all the girls, and all the girls were drawn to him like a metal.

A bored teenager, after praying to god for something to relieve his boredom, got his prayers answered. It just so happens that Systema Kami, the God Of Worldly Systems, was recruiting an assistant!-Ding![System Creator System has been integrated into the host’s soul!][First Task: Create a soul parasite type system.][Second Task: Grant the system to any living being.][Third Task:…]After receiving the System Creator System, Keith embarked on a journey to becoming the greatest System Creator!Training System, Leveling System, Hero System, Villain System, and even Harem System! The possibilities are endless!When he received the system, some of the secrets of his world were revealed to him!Keith McDowell: System, are you serious? There is a book titled “End Note” that has the power to bring the end of anything. And it just so happens that a regressor obtained it which should have been mine?[Yes.]Keith McDowell: And my schoolmates have been summoned to another world as heroes to defeat the demon lord and save the world?[The creator is right. Not only that, there will be a dimensional gate that will open after a month.]Keith McDowell: Finally! My thirst for entertainment can be satiated!In other words, this is none other than the journey of a young man who wants to entertain himself, whatever it takes!

Reborn as Red Army Misha!

- Description from novelbuddy