Toaru Majutsu no Index: New Testament - Volume 15, Prologue: The Reverse Reverse Side of the Coin — Rock_on_Right_Arm.

[Shelter System successfully bound to host!][Option One: City of Light, save the survivors in the apocalypse and become a glorious and benevolent savior.][Option Two: City of Darkness, humans who enter the City of Darkness can only become your slaves. And you, will be the devil ruling over the apocalypse.]Sorry, I am no saint, I choose City of Darkness! From today onwards, I will be a villain!

He was the continent’s strongest and most revered alchemist, Ye Zifeng. He was under one person and above millions. However, due to an unpredictable event, he had died. After his rebirth, he had become the supertrash of the Ye family and suffered disgrace. To make matters worse, he had an argument with his fiancé that led to the break off of his engagement. In this second life, he will work to change his own destiny. He vows to return to the peak of the world, trample on those who laughed at him and rewrite his legacy!

- Description from Novelupdates

After crossing over to another world which seemed to be a fusion between many anime worlds, The Fantasy System was unlocked for Mu Fan. After finishing the tasks given by the system, Fantasy points are given which allows him to gain access to the Fantasy store that was full of daily talents and more.

Yuuki Asuna: You know how to cook a lot of dishes. Can you teach me?

Sagiri: I don’t know anyone called Eromanga-Sensei.

Many more characters and interesting plots await us.

[Palace Intrigue + Sweet Doting + Not Purely Chaste + Heroine Focused on Her Career]

On the first day of her transmigration into the imperial harem, Jiang Xinyu was already out of favor.

Everyone said she was merely a pretty face without substance.

On the second day of her transmigration into the imperial harem, Jiang Xinyu regained the emperor’s favor.

From then on, she held the emperor’s heart firmly in her hands.

She fought monsters and leveled up, rising from a noble consort all the way to the honorable imperial consort, basking in unwavering favor.

Emperor Xuan Wu: At first, it was lust at first sight, but later I became truly captivated by her charms. Who knew this woman had so many more faces that I was unaware of?

Jiang Xinyu: The emperor is the harem’s highest-level boss with the thickest health bar. If I can deplete his health bar, I can become the supreme empress of this harem.

P.S. The heroine is solely focused on her career, yearning for riches and glory, a life of luxury and indulgence. She excels in all pursuits, with layer upon layer of schemes to conquer the emperor’s heart.