Toaru Majutsu no Index - Volume 8, Chapter 2: Girls facing off. Space_and_Point.

After rebirth, she, who used to be a top international spy, becomes the eldest daughter of the Fengs, a fat girl who is ugly and foolish in the eyes of the ordinary people.
Mastering Royal 18 Saber Moves and Purgatory 9 Palms, she rose to fame with the martial arts of Demon Cook.
Upon an imperial edict, she was ennobled as the wife of Lord Cen, and then suffered various intrigues and plots…
She proved herself to be a real overmatch and a true genius to the world…

As a child with an unattainable dream, I yearned to become a Hero, but I veered off the right path. Looking back, my aspiration to save others was nothing more than a foolish dream. I now realize the magnitude of my sins and the impossibility of atoning for them.

Freshly turned eighteen, John Newman, a helpless nerd, suddenly gets video game abilities granted to him. A mysterious higher power, a secret Abyss of magic beneath the surface of the normal world, mages, martial artists, eroticism, tragedy and a harem of hot girls awaits.

Mirian Castrella, a student in her final year of a magical academy, unexpectedly finds herself caught in a time loop and haunted by strange dreams of the Elder Gods. Her plan had been to become an artificer to support her struggling family, but when the Akana Praediar army betrays her country in a surprise attack, everything changes. Instead, she finds herself delving into the dark secrets of the world, mastering magic, finding allies, and uncovering a vast conspiracy. However, just because the time loop can save her life doesn’t mean it can save her from everything. Mirian must navigate a dangerous world changed by the magitech revolution. Her quest to save the world from the apocalypse will lead her to battle magi and beasts, into the unfathomable underground Labyrinth, across distant lands, and into forgotten ancient ruins. Only through becoming a master arcanist who understands the true nature of the world can Mirian hope to stop the apocalypse she relives through time and time again. If she fails, everything she loves will be lost. ‍ What to expect: - Slow burn power progression - A clever protagonist who changes as the story moves from arc to arc - Expansive world-building full of complexity and secrets - A focus on magic - Intrigue and spell-flinging fights - A rotating cast of characters in each arc - Starts slow, then picks up speed