DxD: Matsuda? - Chapter 30: Fill-Her Episode?

One day, I woke up only find out that I’d become a Demon Lord, an individual responsible for protecting a dungeon. The world I’d been spirited away to was one filled with violence. Gigantic monsters wandered through it and competed with each other each and every day for the right to survive. I had no choice but to strengthen my dungeon’s defenses in hopes of living another day—or at least that was what I’d thought. For some odd reason, I instead ended up spending my days in relaxation and bliss.

“The new book 'Scolded as the Star of Death, All the Big Shots in the Capital Rush to Spoil Me' is now available!”Also known as “Reborn Era: Getting Rich with the Check-In System.”[A physical powerhouse of a female lead vs. a vindictive, sarcastic, and elegant male protagonist]After a laboratory explosion, Lin Tang returns to that impoverished era and is bound to a check-in system.Before she has time to claim the newcomer gift pack, her fiancé, sporting an air of confidence, comes to break off the betrothal.The reason being, he's about to secure a stable job.Lin Tang looks at the ordinary yet self-assured man, parted her red lips slightly and said, “...break it off!”Less than a month later, her ex-fiancé was fired for some reason.Lin Tang took a stroll around the county and became the executive officer of the Broadcasting Station in the Textile Factory.Ex-fiancé's internal OS: Is it too late to reconcile now?Those times were tough!Despite being treasured by her three big brothers and parents, everything from food to cloth and even soap required coupons...Even living frugally couldn't alleviate the miserable condition.Looking at the black mush in the bowl, Lin Tang fell silent, “......”Thankfully, she had a system!Need anything? Just check in to get it.Many years later.A handsome man looked at his delicate wife with a fair complexion, managing to keep a straight face as he said, “I heard you could knock out a wild boar with just two punches?”Lin Tang's eyes sparkled, her fingers gently exerting force, and the Enamel Jar in her hand deformed. She responded in a stern manner, “Nonsense! Don't believe those rumors. We're civilized people and can't be that barbaric!”

Avo was born to destroy New Vultun. In a twist of fate, he’ll become its only hope for salvation. The gods were the enemy. The slaver. The chains. With dreams of paradise, humanity slaughtered them and stole their powers, opening the path to become more – to ascend. Instead, they nearly destroyed the world. Vast hive cities serve as the final bastions against the crumbling of reality. New Vultun is the greatest of them all, and within its borders, ascenders wage war to determine the laws of existence itself. The world descends ever deeper into ruination. Avo was born a weapon, a slave to his instincts and his masters. He and his brothers were made to burn New Vultun to ashes. Everything changes when Avo gains immortality and becomes heir to an impossible legacy. He must ascend the megacity of New Vultun. He must challenge the very tyrants that usurped the gods. He must finally free the world from chains.

The simulation is over, and the entry is obtained: a showdown!

Looking at this entry, Zhao Meng was stunned.

“How should this term be used?”

“Hey! Here’s a wounded fox!”

…

A few years later, a woman who looked like a fairy appeared in front of him, and said:

“My lord, I’m here to repay my favor!”

This book is also called “Starting from Transforming Monsters”

- Description from novelbuddy