Re:Zero Kara Hajimeru Isekai Seikatsu - Volume 4, Chapter 4 [The Next Place]

Ken was about to take his own life, after he had experienced a very tragic emotion. However, he was stopped by a mysterious cyan screen before his eyes.“What is this?”The Cyan screen displayed a message. It called itself the Guarantee System, and told him that it would guarantee whatever mission he desires. And through these missions he was to earn a reward, and these rewards were to be massive if the mission he takes, is relating to a… female.Then the question followed…[What will be your first mission?]At that moment, Ken knew… just the right thing he wanted. With a smirk on his face he said.“I WILL GET ALL THE LADIES I WANT!”Hehe'Disclaimer: This story is a work of fiction. All characters, events, and organizations are imaginary and any resemblance to real persons or events is purely coincidental. The narrative is intended for entertainment purposes only and does not reflect real-life occurrences or perspectives.Enjoy!

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.

After dying as a college student, Kain wakes up in a magical world where people form bonds with spiritual creatures to fight alongside them. Determined to rise to the top, he relies on a System and loyal companions.Everything seems to align with his ambitions—except the spiritual creatures he can contract seem to be remarkably…strange

Following the death of his popular online persona, seventeen-year-old Suzuki Mato decides it's time to retire from professional VR gaming. However, his plans are abruptly cut short when he's kidnapped from his high school and forced to be a guinea pig for Genaco Gaming, the world's largest esports and entertainment company. Armed with nothing but his wit and a new online persona, he's thrown headfirst into the virtual reality of “Live No Evil,” a VRMMORPG littered with overpowered bosses, secretive NPCs, and backstabbing gods. His mission? Find a way to conquer this new world and get back at the company that took over his life, all while avoiding 'Parallel' -- a condition that would make it impossible to separate his real and virtual personalities. Because in a world obsessed with VR gaming, Parallel means death, and Suzuki just doesn't have time for that...