Kill Me More Times, I'll Become Invincible - Chapter 249:

A 30-year-old NEET is reincarnated into the body of an otaku that choked to death on instant noodles. As he comes to grips with his new life, he realizes that this world is subtly different from Earth. The denizens of this world are far better looking, and this new world also possesses futuristic technology as well as mysterious Yin Yang masters!

After reincarnating, he realized that he was endowed with a miraculous game-like system, which enables him to increase his own stats and transcend the limits of the human body. This system even has a game-breaking ability to save and load in real life!

In this new world that’s akin to a 2-D game, he just wants to enjoy life and head for a glorious future… However, he is quickly embroiled in a complex plot. Can he unlock his true potential and utilize his system to break the shackles that confine him and discover the truth about his previous body’s circumstances?

- Description from novelupdates

Reborn in the Naruto world, Shin Uzumaki finds himself in the doomed Land of Whirlpools. As a member of the Uzumaki Clan! Trapped in a world filled with war, betrayal, and unimaginable power, Shin’s survival seems impossible.. Until it isn’t!![Ding! Replication System Activated!][Daily Login Reward: Common Replication Card.]​​​​​​​[Newbie Gift: Perfect Sage Body—​​​​​​​Adamantine Sealing Chains​​​​​​​—​​​​​​​​​​​​​​Four Symbols Seal​​​​​​​]With the power to Copy any Ability—whether it’s the Kekkei Genkai or Rinnegan or Forbidden jutsu—Shin begins his journey to dominate the Ninja World. [First task: Save Kushina and prevent the destruction of the Uzumaki Clan.]

In the morgue full of Uchiha corpses, he opened his eyes…

A mysterious voice rang in my ear…

He looked confused: “Saving the ninja world, what’s the matter with me, the remnants of Uchiha?”

- Description from novelbuddy

As tragedy befalls Xin Siyue, she soon finds herself transmigrated into a novel world as a character. To her disappointment, she became the villainess who obsessively chased after the male protagonist while scheming to tear apart his relationship with his beloved.

To avoid her death route, Xin Siyue carefully avoided the male and female protagonists at every turn. Instead, she went off on her own to enjoy life. But somewhere along the way, she made a mistake– the male protagonist took notice of her!

Xin Siyue’s eyes teared up as she was being kissed in Chen Sinan’s arms. ‘No! This wasn’t in the plot!’

- Description from novelupdates