Bog Standard Isekai - Chapter 29Book 3.

In her previous life, Su Nuan was set up by her lover and sister, and died tragically in prison. When she woke up, she had been reborn to a time before all the tragedies had happened. At her birthday party, her sister found some kidnappers kidnaping her, trying to destroy her innocence and get her kicked out of the house. Not only did Su Nuan mess up her sister’s plan, but she also dealt with all the kidnappers.

She also rescued Mo Ting, the most powerful and handsome man in City A. To stay away from her cruel sister and hypocritical scumbag of a lover, she relentlessly clung to Mo Ting. “Uncle, for my poor sake, please help me. I’ll do anything you want.”Mo Ting: “A contract marriage for three years. I’ll give you everything you want during that time!” At first, Mo Ting thought Su Nuan was just a poor little girl who had been driven out of her home, so he helped her.

He was also using her to appease his family’s elders as they had been harping on him to get married. Later, his assistant came to report, “The principal of City A’s university is here. He wants your approval for your wife to participate in the international competition.”Mo Ting: “…Wasn’t Xiao Nuan a hopeless student?”Assistant: “Sir, Madam has blown up! The entire internet is kneeling and begging her to debut in the competition!”Mo Ting: “…When did she become so versatile?” Later, the assistant reported again: “Sir, someone from the National Medical Academy is here. They say they won’t leave if they can’t invite Madam to make an appearance!” Mo Ting: “…I must be dreaming. Go out and come in again. Let’s start over!”

Getting transmigrated inside a novel is not really a bad thing—you know the story, you have the power of the future in your hand, you know all the hidden keys. You might as well end up as the most powerful and omniscient being in that world.That is, if you don’t wake up during the epilogue.And yet I find myself in the body of a fallen priest at the end of the novel, a tragic hero who had his mana circuit broken in the last war, being shunned, drown in debt, and destined to die not long after.Fortunately, I know just the cure.Unfortunately, the cure was in the hand of one of the Demon Lords—you know, the race that my kingdom just wage war with.Would he give me the cure if I asked him politely? There’s no harm in trying, right? I’d die if I didn’t get the cure, anyway.“Sure, but you have to be my bride as the price,” the Demon Lord said....huh? Sir, you know I’m (technically) a priest, right?

At the beginning of the 21st century, twelve reincarnations shattered the void and returned to their hometown.

They preach the world and reopen the space of reincarnation.

Then……

“The Republic of East Asia announced that it will fully implement a five-year spell casting and twelve-year simulation mage training policy.”

“The Republic of East Asia has announced a new change in the marriage law, making it legal to marry someone you call upon after meeting the adulthood conditions of your respective race.”

“The Republic of East Asia announced that the East China Military Region No. 1 Mobile Armor Brigade was established, and the special humanoid mecha “Gundam” officially joined the campaign.”

“Congratulations from the United Kingdom on this, the upper hero Arturia Pendragon will visit Shanghai next month”

“In the far east of Japan, the ignition of the wave engine failed, or seek energy assistance from the East Asian Republic.”

“Space cracks have been discovered in the Chernobyl region, alien creatures have ravaged the Chernobyl region, and the Russian Defense Forces have entered the battle.”

Four years after twelve reincarnators changed the world, Li Ping entered his own battlefield for the first time.

PS: Although the introduction is like this… but in fact it is written about two thorns + machine battle + movie + mythical stew…

- Description from novelbuddy

Roy died during a war against the Evil God Cult, but somehow, he returned back in time to 30 years in the past where he was just a boy who awaken his summoning magic.