MTL - Yu-Gi-Oh!: Underworld Boss, Cancerous Creator God - Chapter 39

(Apocalypse Farming, Sweet Pet 1V1) As soon as she opened her eyes, Su Shu found herself reborn two months before the Apocalypse. Before her rebirth, a certain man watched over her and protected her for three years, almost going as far as dragging her home to swallow her whole. After her rebirth, not only did she have to raise her adorable genius niece, but she also had to take care of a wolfish husband. This Apocalypse was a bit different! The pitiful her from her previous life now not only had a heaven-defying space, but also blood-related family, and on top of that, the indulgent spoiling of Tang Dashao, who sprinkled dog food without restraint. Su Shu thought, even if the heavens required her to reset and start over once again, it wouldn't matter. She would just meet Buddha, kill Buddha; meet a ghost, kill a ghost!

Kai of the Sorcerer’s Tower is one of the last mages left, barely surviving in a world ruled by creatures of the dark — where the era of mages ended, and most of the lands got contaminated with dead mana. To save his world and fulfil his master’s last wish, he put himself through a forbidden ritual, risking his soul being ripped into pieces to make his way into the past. In an era with abundant mana — an era yet to enter the Golden Era of Magic. Things go wrong, of course, as they always do, and he finds himself thousands of years before the world fell to mana contamination — in the body of a young lord, Arzan. All is not well, though, as the young lord was murdered by someone right at the cusp of a beast wave threatening the territory, while larger threats loom on the horizon. There was a lot to do for Kai to regain his former strength in this time of primitive technology, but then again, he might just be able to change that.

He died on the wedding of the girl he had a crush on, after a long and successful career. After convincing Yama to send him back to the world, he decides to fix the areas in which his life went wrong. Realizing the lack of love and romance in his past life, he sets out to conquer the hearts of various women.

5 years after the world changed, the final boss appeared.