It turns out that my Yandere playmate online is my Homeroom Teacher - Chapter 4: This is how the strongest duo play

One choice can change everything in the Multiverse—a simple decision, a single moment, a shift in fate. In the vast expanse of timelines, Subaru Natsuki’s life takes an unexpected turn when a seemingly random choice disrupts the course of his journey.My name is Subaru. I used to think that being transmigrated into a different world would be a dream come true. But after dying countless times, I've realized it's nothing like I imagined. Death doesn’t come easy, and neither does power. I thought I had it all figured out, but now I find myself burdened with gifts... or curses, depending on how you see it.They call to me—the voices of the Witches.“Wow, sorry for visiting you,” Minerva’s voice echoes in his mind, her tone both playful and apologetic. Subaru grits his teeth. He knows too well what this means.“Sorry, Minerva,” Subaru mutters, though his voice is tinged with frustration and confusion.-----MC: SubaruShip: Subaru X HaremNow to make things clear, Suberu is still going too die, die a lot almost, he will still need too deal with everything, just because he and more power's doesn't mens he is fully safe so yeah

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.

This novel is also known as Don't Mess with the Dark Princess

When trash becomes a genius—one word: Fierce! Two words: Two-faced! Three words: Too heaven defying!

She is the foremost and outstanding armament refining master. Passing through a dynasty, and became a publicly humiliated and bullied Third Young Miss. Ancient beasts, too outrageous? Obediently become a docile pet, or I’ll make you into soup!

Ninth rank talent, rare talent in a thousand years? She was born with a godly constitution, crushing all geniuses!

Peak level Profound Grade Armament, beyond priceless? Sorry to embarrass, but the bowl she uses to feed the cat is already at the God Grade….. she possessed a pair of eyes that could see through everything, yet she couldn’t see through—him!

Merely exposing his demonic smile, Prince Mou lightly loosened his belt: “Can’t see through? Do not fret, you can slowly view when you return to the room. I’ll allow you to scrupulously inspect from head to toe.”

- Description from Novelupdates

When he returned to the World of Martial Arts, the game was filled with blood and battles! Chen Kaixin had chased after the footsteps of the one emperor, two empresses, three princes, seven dukes, and thirteen aces for three years, but during the eve of the Sword Among Us tournament in Mount Hua, he was ambushed by evil bastards, and was killed so much that his level dropped to that of a newbie. He completely lost the chance to join the ranks of the powerful players in the game! In great disappointment, Kaixin quit the game and got drunk so that he could forget his sadness, but during that stormy night, Chen Kaixin found that he had actually dreamed for a total of three years, because when he woke up again, he woke up to three years ago, when he was still a student.

- Description from Novelupdates