MTL - Worldly Stunning Blade - v15 Chapter 728 Wu Jian

Shen Dongqing is a powerful, thousand-year-old ghost. He had just possessed a body and hadn’t even relaxed for two days yet when he was pulled into a white, parallel world.

On the first day of the Infinite Nightmare Game:
Other players tremble, crying and wailing wanting to go home.
Shen Dongqing eats, sleeps, and plays ‘Fight the Landlord’ (card game).

The second day:
Other players are chased endlessly by ghosts, crying loudly ‘Save me!’
Shen Dongqing eats, sleeps, and plays ‘Fight the Landlord’.

The third day.
Shen Dongqing……
The ghosts finally set their sights on this lazy player. The other players watch on in glee. As a result, who knew that this slim and pale youth would stand up and easily dispatched the ghosts with his bare hands.

Other ghosts: Can’t afford to disrupt this elder. Let’s go, let’s go.

- Description from Novelupdates

This legend tells the tale of the protagonist, Kuroki summoned to protect the demon king from the hero.

Kuroki, unbeknownst to him, suddenly came to another world. He was summoned by the demon king, Modes. The territory which the demon king overrules was in the midst of being destroyed because of the hero. He had no choice but to bow before Kuroki.

“Please save us, Savior Dono!”

Kuroki nodded, deciding to save the demon king due to an unexpected turn of event.

A young man was going about a normal day, and he went back home to his house being empty again, his parents had missed his birthday again.Just like all the other years before, there was nothing special about his 18th birthday it seemed.This however was far from the end, caught by something unexpected at his own house, he perished.It was supposed to be the end, however this only marked a new beginning.Faced with a great trial of will, and Karma, and passing with a score beyond anything else, he was given the Class Omni-Layer, and the Job Omni-Ruler along side a system to manage it all.All this to prepare him for a new world, a world of swords and magic, and classic isekai, but this world was anything except an easy trip.