Level Up: Voidwalker - Chapter 57: We Need To Cross

The male student, Fukai Nagamasa, ignores his studies for college entrance exams in favor of following the path to chuunibyou. As he fainted during night cramming session before the exams, he realized that he was transported to a parallel world as a feudal lord in the Sengoku Era. Not to mention that suddenly, he was marrying the sixth Demon King, Oda Nobunaga’s little sister, the one who was purported to be an unrivaled beauty?

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.

Jun Xiaoyao was transported to a mystical world and became the divine child of a Clan of the Ancients. He came to possess an invincible background, unparalleled talents and even a check-in system, enabling him to acquire an Accomplished Sacred Body of the Ancients at the very beginning of his new life.

He acquired the Divine Elephant Overpowering Force, a six-star reward, checking in at the Old Tablet of Taiyue.

He acquired the Bones of Supremacy, a seven-star reward, checking in at his Ten Years Old Banquet.

He acquired the Cauldron of Maternal Qi of All Beings, an eight-star reward, checking in at the Bronze Mystical Hall.

He acquired the Grand Method of Freedom Melding, a ten-star reward, checking in at the Borderless Ocean.

He sat on the clouds countless years later, with his sword pointing at the heavens, saying, “I alone shall rule over the heavens and the earth. I shall become the pinnacle at the very end of the mystic path!”

- Description from MTL

Hye lived his entire life without a class. After the apocalypse hit the human world, strange creatures invaded and killed humans while new lands were being added.

Systems were given to humans and with the help of the guides, humans started to fight back for their lives. All of this happened under the watch of the venerable beings who were shining stars in the sky; gods!

Hye dreamt his entire life of a chance to prove himself. He was a hard working, earnestly learning and smart youth. However, the apocalypse never was merciful to such humans at all.

Until one day he got a chance to go back in time, when everything started. At this new starting point, he found himself able to finally obtain what he wanted, a class for himself and power beyond imagination.

But will things be this easy for him?