I Am the Fated Villain - Chapter 1276:

Klein’s greatest wish is to transmigrate to another world and live life in an isekai, just like in anime, manga and novels. However, fate is on his side and the typical truck that the main characters always carry in isekai runs over Klein. But, to his bad luck, he lived a few more days in the hospital and, just on the day he died, Klein heard a ⟨⟨-DING-⟩⟩ that he knew it meant. That was the day of his death, but also the beginning of his adventure into another world.

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.

A senior death fan was studying the Zanpakuto illustrated book, unfortunately choked to death while drinking…

However, by the grace of God, I was lucky enough to travel to the world of “Fairy Tail”, and was reborn in the body of an ordinary magic swordsman from mainland China!

A dress-up magic similar to that of Erza! However, the difference from Erza’s “knight” is that the weapons he used for dressing up–all of them are Zanpakuto from Shinigami! !

Tell me, can he stand up in this world of Fairy Tail?

“It’s not awesome…” A certain house said brazenly, “We can’t waste those Zanpakuto?”

Book group “Accompaniment”: 36367163 (full)

Book group “Ensemble”: 233363178 (missing)

(It contains the plot of amnesia, but there are only thirteen chapters. Children’s shoes that you can’t bear it, please enter carefully…)

- Description from novelbuddy

Suo Fei, a veteran NEET has spent three-days and three nights strategizing his way through the highly explicit H danmei game masterpiece “Yalance”. Furthermore, he was able to capture all nine little shous from the nine great races. However, as the final, 10P feast was approaching, he unexpectedly transmigrated. He transmigrated into the real country of Yalance…

Suo Fei: Hey, hey, hey, can you delete these files and let me restart? What the hell did Laozi transmigrate into!

- Description from Novelupdates