Tate no Yuusha no Nariagari - Chapter 298 - Journal of the Hero

It begins on the mountain.

With the glint of a knife, a flash of steel in the hands of a sworn brother. A betrayal.

Stabbed and pushed down the mountain, Zi Chen lied within the red-stained snow, left to die.

This is where it begins; he is given life by lightning,
baptized by thunder.

Those who had once betrayed him should all suffer in his cruel revenge.

- Description from Novelupdates

There wasn't much to be said about the life of Akhil—at the age of 8, he lost his father at the hands of his most trusted business partner, who was also on his way to becoming the world's richest businessman.This left Akhil with no option but to use that traitor's daughters as a means to kill that man—a rather typical story where the main character takes revenge on his father's killer by making both of killer's daughters yandere.Of course, this wasn't a random fantasy story where he could just reach someone like the world's richest man—sitting at the highest point of the hierarchy—so the most he could do was act as the kind child he once was to those girls and slowly build trust and obsession, which finally bore fruit, and Akhil died.Indeed, how could he even be able to kill a man who possessed that amount of wealth?So, he died in front of both of those women—making sure that they saw him bloodied and dead.....The End.Or at least this was what should have happened.DING![ SUPREME YANDERE SYSTEM —Tada!! ]He opened his eyes inside the body of the Emperor of a ruined kingdom at the edge of the Human Zone—a group of three continents where humans lived while under constant attack from the threat of the 7 Demon Gods—and found himself in a sick body.A kingdom that was nearly collapsing due to corruption, the presence of holy light bearers—Heroes and Heroines—and a world filled with artifacts and fragments scattered around the bloodline—he who needed to lift the whole kingdom up again, hold the reign of a broken kingdom, and move forward.Now born as King Lysanderic Aleria Vandreat, he has only the support of his Supreme Yandere System.Oh, he awakened it too, but when did he?Read the Story...[: The main character is cruel, and there will be darkness in his actions, so enjoy the light in the first ten chapters (those are before he was reborn) and smile as you see the comedy and slight introductions to the characters. ][ Suggestion: If you don't like to know about Main character background, then skip starting 10 chapters. (Yes, the previous chapters are a prologue (not boring ones as they are important for understanding the main character and his future artifacts. Ahem.) ]

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.

With his engagement at hand, the most terrifying and legendary person of the legal world, Fu Huai’an, returns with a son.

Before the engagement…

He asks, “Since you love Wen Moshen, why are you in my bed?”
She says, “Because I cannot watch idly as Wen Moshen’s woman enters an engagement with you.”

With a cigarette in Fu Huai’an’s mouth, he crosses his legs. Across the light cloud of smoke, he squints his eyes—watching as Lin Nuan’s slim arms wrap around his neck; he feels stirred.

So a person can love another so passionately.

“You call what you did a kiss?”
“…”
“What a pure lady!”

Fu Huai’an spews out a cloud of smoke and snuffs out the cigarette. With a mellow voice, he says, “Let me teach you what kissing is!”

But, what he teaches Lin Nuan doesn’t seem to be only a kiss…

- Description from Novelupdates