The Heroine is My Stepsister, and I'm her Final Boss - Chapter 19: Humanity.

“Ding! Choose your idle skill.”“Ding! Idle complete. Language level +999.”“Ding! Choose your idle skill.”“Ding! Idle complete. Basketball level +999.”After a freak accident, Qi Ning acquires the “”Unlimited Idle”” system. But just as the system binds to him, it crashes, leaving a repair time of 999 years. However, to Qi Ning’s surprise, the system still allows him to idle, and with every second of idling, any chosen skill instantly reaches level 999.With his life now dramatically transformed, will Qi Ning’s rise from mediocrity be unstoppable?

Four years ago, the first-ever Armageddon Class Anima appeared on Earth, destroying everything that it touched and threatening the lives of the entire world's population! But along with it came Superhumans that had the blessing of mana. They rose up to fight against the Armageddon, and leading them was the strongest Superhuman, KING.After two days and three nights of nonstop battle, KING gave his life to stop the Armageddon and give the Superhumans a fighting chance against the invading Anima, and everyone in the world remembers his good deeds and sacrifice!...Mark was just an average Superhuman living in City A. His daily routine was skipping classes and hanging out with his only two friends while hunting for Anima in secret whenever he could. But this easy life was not going to last for long as the hidden power he sacrificed a long time ago began to awaken once more![Initializing Superhuman System...][Recognizing Host... Host Recognized.][Parsing Constitution. Host Fully Healed. No Traces Of Residual Damage.]“Hello once again, Mark Vanitas. Has it already been four years?”

“Dane?” “Yeah, the bastard whose head I smashed with a fire extinguisher.” Grayson Miller, whose life goal is to meet his destined partner just like his Papa and Daddy who gave birth to him. However, even after dating countless people, he hasn’t found the right one. Desperate, he even sought out a renowned shaman, who told him that his destined partner was someone connected to ‘fire’ and has ‘big breasts’. Doubtful, but still pondering how to make the connection, he attends a pheromone party where a sudden fire breaks out. While toying with the omegas and spreading his pheromones left and right, he suddenly lost consciousness after having his pheromones controlled by a certain Extreme Omega. After waking up, Grayson realize that his destined partner might be working at the fire station, and with his father’s help, he gets a job there through connections. However, from the very first day, he gets into a physical fight with the firefighters who were keeping him in check, and among them, he also gets particularly entangled with that Dane Striker bastard…….

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.