The Villains Need to Save the World? - Volume 2 Chapter 79: The Weekend Arrangement after Returning from a Rewarding Journey.

Perhaps it is the choice of fate. As a senior otaku, Qian Lingfeng got the “steel shell system”. However, when he swept the world with the system, became a local rich man, made all kinds of beautiful women, opened a harem, and realized the ultimate fantasy of thousands of otaku, he found that things seemed far from simple!
When the end comes, biochemical zombies suddenly come down, fierce beasts are in power, bloodthirsty zerg roam to kill the world, and human lives are comparable to dirt. Where will weak human beings go in this world? Is humanity going to be extinct? Or … can an otaku save the fate of the human race?

- Description from Novelupdates

The dominant forensic doctor who traveled back in time to the era of the Great Tang's Zhenguan reign, became a distinguished family's abandoned girl.

Kanda Kyoichi transmigrated to Konoha and became a temporary instructor at the Ninja Academy. Fortunately, he awakened the Mentor System.By teaching others, he could earn rewards.Thus began Kyoichi’s career as a “teacher” in the ninja world.Shisui: “Sensei’s unique interpretation of the Will of Fire has given the Uchiha Clan a true sense of direction!”Asuma: “The essence of the jade lies in protecting the people, with the advanced leading the way for the less experienced. Only then can Konoha become stronger!”Kakashi: “He’s my life mentor. He transformed Konoha!”...Years later, in the memoirs of Kyoichi, now the Hokage, he wrote:“I honestly just wanted to be a life mentor!”

Haruto Saito, was playing a mobile game called “King of Cards” when his phone exploded due to overheating. He then transmigrated into the world of Naruto and found out...Why can I see the name, identity, and reputation of each of them?Killing hostile ninjas will drop cards? Ninjutsu cards! Taijutsu cards! Forbidden jutsu cards! Mystic jutsu cards! Can cards be eaten? Will you gain corresponding abilities after eating them? What are equipment cards? Killing Uchiha clan ninjas can drop Sharingan bloodline cards? Killing Hyuga clan ninjas can drop Byakugan bloodline cards? What if I kill Kaguya? ! !Naruto world is gamified! Reputation exchange! Ninjutsu enhancement! Achievement rewards! Unlimited first kills!“Excuse me, I'm not targeting anyone, I just say that everyone here is garbage!” At the Five Kage Conference, Haruto Saito said lightly, tapping his fingers on the table.