Counterattack System appeared when I'm already At The Mahayana Realm - Chapter 8 - The Lobbyist

After the fall of the Galactic Federation, long-time lovers Lu Li and Xie Jianwei defeated the alien invaders, and formed the Empire with Lu Li as marshal. Everyone thought that all was well between them, but.

Xie Jianwei one day found out that Lu Li’s personality had split into several parts.

They were all individuals, yet still the same Lu Li. How could Xie Jianwei bear to watch as each Lu Li plot to kill the other?

Xie Jianwei used his SSS-class spiritual strength to enter Lu Li’s inner world, where Lu Li was god/director/actor all in one. To get to the bottom of the mystery, Xie Jianwei had to act along Lu Li’s delusions, else the dreamworld would collapse, worsening Lu Li’s condition, and split the personalities even further.

- Description from Novelupdates

Van and his friend Magus had reincarnated in another world with magic. Tasked to kill the demon lord, they set forth.Van was granted very rough skills that made life for him in that world a living hell, yet he muscled through.Magus however, was bestowed with unfair skills. Due to some of said skills, he gained a harem, which in time, included the girlfriend Van made in the world.After beating the Demon Lord, and after finding out his girlfriend had been stolen from him, he got very upset and so he went to propose to... The Demon Lord...!?

From a caste based high school, bottom-tier Naomi Masatsugu is caught up in a summon of his class to a different world. However, as soon as they arrived the king said, “This guy is unnecessary because he only has clumsy skills ” and it is concluded that he is to be forced to administer the orphanage, which no one wants to do. Unfortunately for the orphanage his skills were cheat skills that cause the girls to cling to him.

In order to “defend” the girls that depend on him, he must operate the orphanage while overcoming the powerful people, authorities, and former classmates that surround him.

I fell into a game world out of nowhere with an instant kill skill.
And then somehow, I became a bigshot.