The Demon's Bride - Chapter 721: Other Beelzebub-I

“Teacher, you know me. I’m usually a good student, with nearly 100% attendance, and I’m also eager to help the people.

Yesterday I flew to the coast to fight monsters, so…”

“Teacher, you know me. Which teacher is not full of praise for me, but things are prioritized. Yesterday happened to be the Ghost Festival. Hundreds of ghosts walk at night, so I…”

“Teacher, you know me well. I am an activist in our dormitory. Every day I call them to go to class, but under special circumstances, so…”

“Teacher, I’m a foreigner, I don’t understand what Xie said, and I didn’t know there was a class yesterday, so…”

The teacher took off his glasses and rubbed his temples, “I can tell that everyone in your dormitory has stunts, but this is by no means a reason to skip class! This class! This year! You guys are all done!”

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Another version of the introduction: Ultraman Delta was living in another world for unknown reasons. Originally, he wanted to be an ordinary college student, waiting for one day to find a way to return home.

But the sudden appearance of a monster disrupted his plans, and he also discovered that his roommates were not ordinary people either.

- Description from novelbuddy

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

Betrayed by his beloved queen.Stabbed by the very men he raised to power.King Alaric died with a broken heart… and a blade in his chest.Fate’s twisted joke?He’s reborn—in chains.Collared. Beaten. Sold like cattle.Once a mighty ruler. Now a slave in a world of magic, monsters, and bastards with crowns.His new master? Arrogant with even little much money, and the personality of a wet cabbage.And the wife?Let’s just say... she deserves better. Much better.Just when he thought a future of licking boots and scrubbing chamber pots—[DING! You have awakened the Domination System.]Rule the strong. Break the proud. Tap the wife. Steal the life.“I—wait, what?”[New Quest: Subjugate your Master's Wife.][Reward: +500 Power | Domination Skill Unlocked – Command Voice][Bonus: Do it on the master’s bed for extra EXP.]He grins through the pain, eyes burning with ambition.They thought they broke him?They just gave him a reason to rise.Power. Revenge. Pleasure.He’ll take it all.------------------Note- No ntr, no yuri.Mc won't abandon his women, neither he will force them, and not every women will be subjugated.And System isn't all about subjugating others wives, it's just one of it's features...

“For those who dare call themselves gods, I, Wen Ran, will crush their legacy beneath my feet. Even dogs are more honorable than those filthy bastards!”A feared Godslayer, who, due to betrayal, perished under the might of the heavens, having his world destroyed. Saved by a mysterious system, Wen Ran was granted a second chance at life but reincarnated in the body of a lowly slave. Hunted by the gods who sought his head, Wen Ran vowed to reclaim his title by showing heaven his vengeance as a 'God Slayer.'