Isekai Maou to Shoukan Shoujo Dorei Majutsu - Volume 1 Prologue

Iona, the knight who was the loyal dog of the tyrant Emperor, gave her life for him. But her lord, whom she trusted, abandoned her in the end, and the person who stood by her side in her death was no other than her husband.“I want to kiss you one last time.” Iona demanded on the verge of death.“I’m telling you in advance… Just in case… You won’t die and this won’t be our last kiss.”Satisfied with her non-lonely death, she closed her eyes.When Iona woke up again, she realized that she had returned to the past and her husband was again chosen to be her partner.Though her past wasn’t good, one thing she also didn’t want to change was her husband, the only success in her life. If so, she should at least turn this marriage into a ‘successful marriage’, she decided.“Lord Leroy, I will formally propose to you; Please marry me. I will definitely make you happy.”Iona was determined to repay her husband for his generosity. Just the way she wanted.

Through a mysterious portal, Chen Jin arrived at this strange place – a post-apocalyptic world where civilization had been destroyed.

Consequently, he found –

A piece of metal scrap
A robot trash collector
A battleground
A city
A ton and more of gold
A copy of high-tech documents
A…
In short, Chen Jin found a planet.

- Description from Novelupdates

A boy awakens alone in the Fairy Tail world, lost and uncertain. As he ventures through this magical realm, he unravels the secrets of his mysterious new identity, unlocks hidden powers, and carves out his destiny in a land brimming with wonder, danger, and limitless adventure.“Check out my other work, Reincarnated as Ash: A Pokémon Tale.”