Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e - Volume 4.5, Chapter 5: Classes Gathering Part 3

In a world where everyone has a system, Liang Yu, who had lost his previous system, finally received a second one. This time, he was playing the second male lead instead of a cannon fodder.

He has one mission.

Bend the male lead.

Liang Yu: I can do this task just fine. But Lord God, please don’t drop the novel again.

- Description from Novelupdates

The tale of Oliver.
An orphan boy from a Mine, in 19th century Europe, filled with Magic.

Ruel finds himself thrust into a brutal post-apocalyptic world, bound to a bizarre “Milf System.” This system demands morally questionable acts – NTR, seducing milfs, and claiming other men's wives – as the sole means of gaining strength and essential survival skills.The brutal reality of this new world awakens Ruel's hidden lust and dark desires. He swiftly abandons any semblance of morality, embracing the system's perverse demands with growing fervor.Driven by an insatiable hunger for power and pleasure, Ruel revels in the ravages he inflicts, using his newfound abilities to dominate and conquer.His journey transforms him into a ruthless force, where survival is intertwined with the satisfaction of his darkest urges, leaving a trail of broken relationships and conquered women in his wake.