Otome Game no Heroine de Saikyou Survival - Chapter 218.1

She was originally the king of the dark mercenary world, killing, plundering, and looking down on the world; once reborn, she became a powerful family that shocked the continent, the “Ninth Young Master of Waste” of the Beiting family;

From then on, the elegance of the world, shake hands;

Belonging to ancient monsters, possessing a magical space, practicing heaven-defying skills, killing the sky, killing the gods, and doing whatever they want;

Cool and handsome, domineering and arrogant, leading the world to compete;

In this article, the male and female protagonists are double C, male strong + female strong, and the ending is one-on-one;

- Description from novelbuddy

Leon transmigrated and became a lab rat for Hydra. But he ended up awakening the sign-in system.[Ding, sign-in reward: Glint-Glint Fruit(Pika Pika no Mi).]He starts by destroying the Hydra Base.He accumulated some time and got himself another reward![Ding! Get the sign-in reward: Sun Breathing Technique.]

She, a hidden technology boss, is obsessed with blood and kinship. She died tragically in a previous life and has a new life. She just wants to protect her true relatives!

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?? He, the Emperor of Dark Night, glanced at her inadvertently and caught a glimpse of her stubborn appearance with tears in the corners of her eyes. Since then, he has embarked on the road of pampering the girl, and he will never return!

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But who knows, the Jiaojiao girl in her arms is a real all-around boss.

The boss of the world’s No. 1 chaebol: “Is there any order for Miss An? The little one is willing to help Miss An.”

Dean of the Global Research Institute: “Miss An, I heard that you like the sea, I bought ten islands for you…”

The world’s number one hacker: “What? Someone bullied my boss? Hehe, courting death!”

The world’s first medical doctor: “Miss An, do I have the honor to come to your twentieth birthday party?”

…

When luxury cars came to the capital and the big guys lined up to greet the girls of the An family, the world shook, and the whole world was shocked!

- Description from novelbuddy

The world had changed when the System arrived, alongside the Cataclysm that filled the world with monsters. The technology was gone, replaced by classes and skills that allowed the people to fight back. When Devon ended up as a Blacksmith, a class that didn’t grant Intelligence, he had to face the reality, that his old career that he loved - mathematical sociologist - was over. Instead, he had ended up as yet another discarded member of the production class, overshadowed by the existence of the System Shops to the point of total marginalization. But, what if all he needed was to reapply his scientific thinking to the System...