One Piece - I Am A Different Luffy! - Chapter 444 - 443 - Neo Marine 02.

There was a time when every living thing was decimated and the galaxy was forced to restart with a single thought from the evils.“Is the final boss my wife?” Xu Chang’an exclaimed as he looked at his wife who was making dinner and shook his head. “The system must have malfunctioned again.”Under the tree in his garden, Xu Chang’an wrapped his arm around his wife’s waist and said, “There is something I have to settle outside. I’ll be back soon.”“Okay. Stay safe.” After seeing the husband off, his wife raised her head to look at the leaves and said,“I think my husband is going to cheat on me soon. Should I… just restart this world?”

Almond Crowshade was the last surviving human in a dying world whose people failed to conquer the Grand Abyss Labyrinth’s 30th floor in time. The world was getting destroyed, and Almond was the last one challenging the 30th Floor multiple times despite the imminent destruction of the planet. He ultimately defeated the Floor Boss on his dying breath by achieving a true awakening, acquiring an X-rank Trait that signified limitless potential. Alas, he won but there was no home or future for what he fought. But a mysterious figure arrived there, feeling pity and amusement. “This is too precious and fun of a toy to let it rot here. You shall reincarnate and climb up to make things interesting.” [Transfer to another world commencing…] [Your memories will be sealed, and you will reincarnate in another world that has welcomed Grimworld’s tutorial like this one. Clearing each floor of the Grand Abyss Labyrinth will unlock a portion of your memories, until the 10th Floor upon which you will gain your full memories.] ‘I’m giving you a second chance. This time, you must clear the Grimworld’s tutorial and step onto the big game to make things instresting and entertaining.’ [Good luck.]

“Just leave, boy. I have arranged a marriage for you, and she's a stunning beauty. Consider yourself lucky!”With his master fleeing with the money, Lin Chen, filled with sorrow and anger, left the mountain to find his fiancée. However, on the way, he was abducted by a beautiful woman who forced him to pose as her fake boyfriend. The most important thing was, this woman looked exactly like his fiancée.

I exist in the darkness, disappear under the bright light, and will eventually devour the sun and turn into the shadow of all things… Known by people as the indescribable terror of darkness; the king of shadows; the dark day; the existence of the shadow of the world , is still just a somewhat special high school student, facing a weird death game…

- Description from novelbuddy