One Piece: From the Rocks Era to King of the World - Chapter 104 - Rocks Takes Action

Charles or rather Xavier Dame was your average loner—broke, ignored, and invisible to the girls. But everything changes the day he awakens the [Harem Points System], a mysterious power that rewards him for physical and emotional interactions with women.From casual touches to heart-throbbing confessions, every action earns him points that can be exchanged for powerful skills, items, and stat boosts. Suddenly, he's not just charming—he's unstoppable.But things aren't that simple. The more hearts he wins, the more enemies he makes. From jealous rivals to yandere lovers and hidden organizations interested in his strange system, Ethan will need more than luck to survive his rise from zero to ultimate harem king.Can he keep his growing group of powerful beauties happy... and alive?

Nessa was transported into a new and completely unfamiliar world where monsters roamed free and survival of the fittest was the supreme rule for the majority of them. In this world, which was beautiful yet dark and cruel, she was given an opportunity.An opportunity to build her own nation after becoming the leader of a few peculiar monsters.Will she be able to overcome those who oppose her, threaten what she is creating, and demonstrate her power to the world in order to achieve peace and acceptance, or will her efforts in this world be futile?[System notifies]Come join Nessa and a few kind souls on their journey to create a nation where monsters, humans, and other creatures can coexist and live happily.

MC (female protagonist) dies in a plane crash and wakes up in the body of a beautiful but corrupt and lascivious prime minister in ancient times, Zhang Qinglian. As circumstances decree, he (she) cannot reveal that the original owner’s soul is gone else calamity might occur. So he (she) decides to walk a righteous path, determined to help the lovely but simple little emperor rule the country. Not backing down after facing torture, not losing courage, destroying rebellions and facing off with scheming princes.

- Description from Novelupdates

King Grey has unrivaled strength, wealth, and prestige in a world governed by martial ability. However, solitude lingers closely behind those with great power. Beneath the glamorous exterior of a powerful king lurks the shell of man, devoid of purpose and will. 

Reincarnated into a new world filled with magic and monsters, the king has a second chance to relive his life. Correcting the mistakes of his past will not be his only challenge, however. Underneath the peace and prosperity of the new world is an undercurrent threatening to destroy everything he has worked for, questioning his role and reason for being born again.