Immortality begins with Becoming an Alchemy Grandmaster - Chapter 210 - 125 High-end Black Market,

The world where the Hero and the Demon King continue to oppose each other. The grand magic from the Hero and the Demon King cross over worlds and exploded in the classroom of a certain high school.

The students who died in the explosion will be reincarnated in a different world. The protagonist, who had the lowest reputation in the class, was reincarnated into a spider. Nevertheless, she adapted quickly to the present condition with strong willpower.

This is a story of she who has become a spider trying whatever she can to live.

Lucian Black awakened to be the most powerful hunter in the world, but he even with all these powers, he could not protect that which he holds dear, and had to watch her die.Devoid of any feeling, he decided to focus his hatred on the monsters that caused all his suffering, and he became a killing machine until one day, he was betrayed and poisoned by those he works with but fate had another plan in store for him as he returned back to the day of his awakening, the day he awoke the most broken ability in the world.With this second chance, he vows to protect his sister and find out what really happened to his parents.

After the Catastrophe, every rule in the world was rewritten.

He died on the wedding of the girl he had a crush on, after a long and successful career. After convincing Yama to send him back to the world, he decides to fix the areas in which his life went wrong. Realizing the lack of love and romance in his past life, he sets out to conquer the hearts of various women.

- Description from Novelupdates