Counterattack System appeared when I'm already At The Mahayana Realm - Chapter 31 - : Beauty, Treasure, Power

On the day of her escape from prison, she had died unexpectedly and was reborn into the body of Madam Huo.
He was the heir to the number one financial magnate. She had charged out of nowhere and from then on, the obedient and weak Madam Huo had started to awaken. She had been trampled under her feet.
Huo Shao had expressed that since she had already been conquered, wouldn’t it be too unfair for her if she did not give her body to him?
The muzzle of the gun was aimed at her head, “I only lost my wife and did not divorce. Choose between loving me or dying for love. ”
Gu Ruochu,”…”
Do I still have a choice?

- Description from webnovel

Transmigrated into the world of Bleach, yet with no cheat, no special talents—just the meager edge of foresight. Higashi Shuuichi couldn't help but curse: “What the hell kind of advantage is that?!”So he made a swift, ruthless choice—cling tight to Aizen, survive his chaos first, worry about everything else later!

This novel is also known as The Demons Beside Me

Chen Zhao can summon demons and see Death.

“Beelzebub, use your Gluttony ability to treat this patient’s anorexia.”

“Raymond, this old man wants to regain his manly function. You know what I mean.”

- Description from Novelupdates

One day every human on the world suddenly receives a mail claiming to enact the World Salvation Project. Half in doubt Kurosaki Shion, a diligent university student and loner, follows the mail’s instructions, becoming one of a million Demon Kings governing his very own Domain in the new world.

*** This is a post-apocalyptic story containing many fantasy elements. It is a somewhat dark tale following Shion as he grows while aiming for the unification of the all too sudden new world. It has many game-elements bolstered by strategical thinking while at the same time providing funny moments and romantic encounters.