Toaru Majutsu no Index: New Testament - Volume 7, Epilogue: Once It’s Over. to_the_Main_Line.

An average man is reincarnated in the world of DxD! How do you survive in a world of battle-hungry monsters? With a cheat skill, of course! Devour the competition, becoming stronger with every fight! From the depths of the Familiar Forest, the Beast King will rise. (Harem, Gamer!SI)

Rumor has it that the fourth Wangye in Xuan Lang Empire was handsome and couldn’t be compared to anyone else. He held impressive contributions, gaining the favor of the Emperor. No one else had that honor within the present royal court.

Rumor has it that the fourth Wangye’s methods were cruel and murdered people within the blink of an eye, leading people to be scared out of their wits!

Rumor has it that the fourth Wangye was cold-hearted, placing no one in his eyes.

However, the truth was —

“No good. Fourth Wangye, the Firefox and the nineteenth Wangye are in a fight and ruined the library collections!”

“No harm, just put things back in order, then it’s fine!”

“Not good. Fourth Wangye, the Firefox secretly ate the millennium Seven Colors Fruit that the Emperor had rewarded!”

“No harm, as long as it likes to eat it then it’s fine!”

Everyone within the fourth WangFu knew that the Firefox was their Wangye’s treasure.

However, when the Firefox transformed into a person—

Heaven ah! Look at the pair of lily-white hands. Su JiuJiu was completely stunned and worried. Didn’t she cross over as a fox? How come she had transformed back into a person now?! Then, is she a person or a transvestite?!

- Description from Novelupdates

“No matter what I would do, my actions would inevitably change the story. I knew this already.... But what do you mean that I changed the plot even before reincarnating in the novel!? ”

...

Should I follow the plot of the novel? Or should I do as I wish? Maybe I should follow the plot while making changes favorable to me?

These would be the first questions of those who reincarnate inside a novel. However, due to a certain event, Sol didn't have that luxury. He had already influenced the plot.

The change he created wasn’t small either. If nothing was done, the novel would head for a 100% certain bad end: Destruction of the multiverse.

Luckily for Sol, the plot of the novel had yet to begin. It would take a few months before everything starts in earnest and all the dimensions combine, bringing along the dying worlds and their catastrophes for the Great Merge.

“Yes! I will enjoy my life to the fullest!”

Calamities? Future Catastrophes? Inevitable Destruction?

Sol doesn't care for those things. He has a single aim, to live a life that would make even the Gods jealous!

Be it the hero who brings hope, the villain who crushes the protagonist, or the enigma who controls everything while staying in the background. Sol will switch to any role that benefits him.

But will everything go as he has planned? The longer Sol lives in this new world, the greater mysteries he comes to face. To start with, his new identity itself is….

Seven years ago, she freely and easily abandoned ￥100 and ran away, carrying her unborn son with her. Seven years later, she returned with the lady killer’s genius son, never expecting that her darling son would sell her out to MBS International. Unexpectedly, her immediate superior was the Mr. ￥100 from seven years ago!