Princess's Struggle for Survival - Chapter 15: Perfume

This is a world where science and magic coexist.

Some people here seek powerful magic, and some seek eternal truth.

A science tyrant who came from another world, started as a little librarian, with magic in his left hand and truth in his right, kicking the door of the new century with one kick.

Some people call him the forerunner of magic, some say he is the founder of science.

Some people describe him that way.

In the new century, Blair is a symbol of evil.

- Description from novelbuddy

Haruto Hayase was a normal high school boy in his third year, living a quiet life until his younger sister, Haruka Hayase, joined the same school. Haruka’s beauty and charm made her the center of attention, quickly becoming the school’s prima donna. But when a notorious gang leader set his sights on her, he did everything in his power to protect her—only to fail tragically. Haruka was brutally assaulted and tortured, and Haruto himself suffered an agonizing death. However, in a twist of fate, Haruto is given a second chance, waking up a year before the events that shattered his life. Armed with the mysterious ‘Debauchery System Slave’, he vows to exact revenge on those responsible. This time, he will use his newfound powers of the system and charm to seduce the loved ones of his enemies. From their mothers, sisters, and lovers to their closest friends, Haruto will make them his. His enemies will suffer as he steals what they hold dearest, ensuring their downfall in the most devastating way possible.

When she left the capital city, she was fat, chubby and white in everybody’s eyes. When she returned to the capital city, she was perfect; a goddess in everybody’s eyes.

A reporter once asked her: What do you think is most important for a woman?

She simply smiled and answered: The most important thing is to be good to ourselves.

When a person has a crush, other than the person himself, no one will know.

- Description from Novelupdates

What kind of experience is it to be a true spiritual genius, transmigrating to become the ‘king’ of the Immortal Demon Great Qin?

Qualification is supreme, and any technique can be mastered quickly. The so-called barrier of practice cannot hinder his breakthrough at all!

Or add luck and become the real master of the plane.

Is it to gather the copper of Kyushu, cast twelve bronze figures, hold the souls of millions of Qin warriors, swept across Liuhe, and conquered the world, or the three worlds of warriors?

Rare birds and beasts, a world where demons are rampant, a combination of local myths and legends.

PS: It is not a hegemony text of the war system, the first choice for the extreme genius stream

- Description from novelbuddy