MTL - Summoner of Miracles - Chapter 2505 A changer of the times

He was the scion cast aside by a powerful family, and he had hoped to return to a peaceful life in the city, but unexpectedly, trouble arose once more!

Failing in his job hunting, Sanada Kyouichirou was hopeless in this society. When kyouichirou had thrown himself towards the bottom of a cliff. When he woke up his body had returned towards when he was in fifth grade of elementary school. He did not want to have any regrets in this life so he had decided on building up an harem in this second life.

The elder sister that he admired, a senior and president of the student council at a school for rich young girls, a strong minded upper classman at school. The poison fang of Kyouichirou who had pretended to be a innocent child attacks those girls.

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.

As soon as he opened his eyes, Li Ming was plunged into these tumultuous interstellar spaces, where countless civilizations held their shotguns at the ready, eyeing everything in the universe with covetous intent. For him, the most crucial issue at hand was solving the problem of food and warmth.Fortunately, he could control special items and gain special ability bonuses—【Thunderclap Armored Exoskeleton—Grade D】【Control Effect: Power Amplification—100%】【Control Ability—Armored Four Arms: Develops four mechanical arms to aid in combat, and amplifies control by 50% with Thunder Element.】He could even evolve it—【Electromagnetic Power Engine】→【Cold Nuclear Reactor】→…【Stellar Furnace】………An evolutionary path with no boundaries in sight, a supreme arsenal spread across the galaxies, and a grand expedition fleet casting endless blood and fire.When Li Ming unfolded the prism wings that covered planets and fired the super-range photon lasers, and the Stellar Furnace in his chest blossomed with a brilliance far surpassing the sun’s, supported by computational power from the Quantum Photon Calculator...In the universe, countless life forms exclaimed, “Flesh is weak; ascend through machinery!”Li Ming helplessly said, “but this really isn't mechanical ascension...”