The Reincarnated Assassin is a Genius Swordsman - Chapter 557

Ye Lingchen was a regular high schooler who struggled with exams and expectations from his parents.

All that changed after he woke up from a strange dream and discovered that he had been granted the ‘Prodigy System’. His life changed from this point on. Reading a book allowed him to learn its content immediately. Listening to lectures granted instant understanding of the lesson. Observation of a technique imprinted knowledge of the technique used.

Learning had never been so easy, and as the saying goes, knowledge is power. In this case, he now had access to a ton of unbridled power.

What does it feel like to become a ‘prodigy’ overnight? Follow Ye Lingchen on this journey to discover the limitless possibilities…

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

In regards to the MMORPG Cross Reverie, Sakamoto Takuma boasted an overwhelming strength that was enough for him to be called the Demon King by the other players. One day, he gets summoned to another world with his appearance in the game. There, there are two people that insist “I am the real summon master.” Takuma gets slave-turning magic used for summoned beasts cast on him by the girls –

With the revival of spiritual energy and the breakdown of the order of species, it is a difficult test whether human beings can still stand at the top of the biological chain.

(There is already an old book, The Strongest Descends in the City, you can read it.)

- Description from novelbuddy