Bog Standard Isekai - Chapter 36Book 1.

He rose from abjection and achieved eternity in glory.
He embraced the prettiest beauties and killed the strongest opponents.
He was able to shift the clouds into rain and cover the sky with one hand.
He could overrun the entire world and go anywhere as he pleased.
He pacified wars and held the world in awe.
He was matchless in the world.
However, his hair turned white overnight for his beloved woman and he was on the verge of death.
He was surrounded by enemies who were trying to take his life.
He struggled his way to become mighty and fought for everything he cherished.
For this age, he was the only king of the Dark World.
His name was a byword for might.
As a man living in the world, his only ideal was to pursue brilliance.

Gon is the son of the duke of Hannan, but he has one problem, he has no mana. This makes him the subject of mockery among everyone in the town.It seems this is his destiny, to be ridiculed until his death but while dealing with a scroll his grandma left him, Gon gets the harem system.Name:Level:Skills:Conquered women:Potential women:The system gives him a new life and guides him to become the most powerful mage but of course this comes with enemies who Gon has to fight.This book is rated 18 because it contains lots of lemonsThere's NTR, there might be yuri.

He was aloof, reticent, and indifferent to women. Many girls expressed their liking for him, but he refused all with three sentences: “No way,” “No need,” “No possibility.”Except for one person—her.Since she moved in and lived with his family, he changed a lot. The used-to-be aloof guy not only helped her with her homework but also protected her all the time. He liked to tease her every day.“Be good. I'll let you kiss me.”“I will only answer your questions.”“One wrong letter, one kiss.”