I Have 10,000 SSS Rank Villains In My System Space - Chapter 4: Challenge

In her previous life, she died of hatred in a gray robe.

The former cannon fodder was reborn, opened the inheritance of the mysterious jade pendant, washed out the top meridians, and rose to the top in red.

Those who persecuted her, hindered her, calculated her, died! !

There is a jade pendant in hand, and countless treasures are detected, all of which are welcome. She frowned and looked at the man in front of her, and said lightly, “I’m sorry, I made a mistake, I took it wrong, and you can go.”

God knows when this man was taken over by her and hurriedly threw it away. “Don’t make trouble, madam, go home, you are the oldest in the family.”

- Description from novelbuddy

Hakuto's life changes forever when his father Shin— a man with highly questionable morals—marries Kagura Kurotsuki, the CEO of a multinational company, and they move into her luxurious mansion.There, he meets the alluring daughters of his new stepmother: the seductive Yuzu—who doesn't hesitate to tease both her new stepbrother and her stepfather in ways that are... rather bold—and Rika, more introverted and irritable, yet just as sensual.But nothing is truly as it seems...Kagura is a succubus, but Rika and Yuzu are different.They were born from a demon and a vampire—something that shouldn’t be exsiste.Because of that, demons, vampires, even humans want them.But Hakuto won’t allow it.He’ll never let anyone hurt his beloved stepsisters.

Lin Wanwan is a pitiful mentally-disabled girl. Not only does she suffer abuse from her stepmother, her stepmother even attempts to use her as a sexual commodity to pleasure others. Eventually, the poor Wanwan dies from an overdose…

The world was once at war with 10 alternate worlds. This was known as the Concept War and our world won 60 years ago. All of this was concealed so no normal people are aware of this fact in the current time.

After the death of his grandfather, the high-school student Sayama Mikoto is suddenly summoned by the giant corporation IAI. He learns this world is headed for destruction due to the acceleration of the Minus Concepts. To prevent this, negotiations must be undertaken with the survivors of the other parallel worlds so their 10 concepts can be released.

And so Sayama is caught up in the final battle to clean up after the Concept War which left behind so much enmity.