Invincible Saint Salaryman the Path I Walk to Survive in This Other World - Chapter 139: Role of a Leader

After dying, you wake up and realize you've been reincarnated as a background character who is judged as human trash.The decision to change your destiny comes instantly.Discovering that your identity isn't as simple as you thought, you feel favored by the heavens when you manage to become a powerful character.Katase: You won't fool me. I'll expose you for the pervert you are.Murayama: ...Thank you for saving us.Issei: Motohama, what happened to you? How are you so powerful?Rias: If you join my peerage, I wouldn't mind being yours.Sona: You beat me in the game. That means you're now my fiancé.Yasaka: Honey, Kuno wants a little brother.Kaori Houjou: Shinji-kun, let's go on an adventure.Kaede Kazama: Shinji-kun, thank you for saving me from that ball.Rie Sawada: Shinji-kun, I'll wait for you. You'll be my future husband, fufufufu...Changing known history and taking it in a direction not even his eyes could perceive, he didn't stop no matter what. Not even the other world was safe from his clutches.Lexia Von Arselia: My hero, and my future husband...Shinji advances without stopping.“I, Shinji Motohama, swear here and now that I will reach the top of both worlds.”

A strange store which sells everything suddenly appears in the town. The Owner of the store is a young man and anyone who tried to mess with him %$#@.

The products of the store are expensive, yet the queue outside the store never stops.

“So what, If you're an emperor. I'll fight to the death with you if you try to break the queue.”

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.

Jonathan Brandit was once on the path to becoming a professional basketball player, but a car accident changed his life forever, leaving him wheelchair-bound and filled with regret. Haunted by thoughts of what could have been, Jonathan spends his days shooting hoops in a gym. One day, he suffers a heart attack and wakes up in a completely different world, in the body of another person.To his astonishment, Jonathan realizes he's now living inside the world of a novel he once read, titled “Turning Point,” which revolves around basketball. He has become an “extra” player name Ethan Albarado—a benchwarmer—on the protagonist's team, Lucas Graves.With this unexpected second chance, Jonathan or Ethan Albarado is determined to achieve his dream of becoming a pro basketball player.But in this new world, will he rise to greatness, or will he face new challenges that threaten to bring him down again?