Crossing the Other World to Build Gundam - Chapter 48: Momoka Warika

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.

Saintess wants to turn me into a sword spirit; the master wants me to be a rebel disciple; the blindfolded sword fairy senior sister wants to make me her slave; the fox from Qingqiu harbors ill intentions; the little dragon girl always drools over me; the princess wants to keep me in the deep palace...All I want is to cultivate immortality, so why do they always have designs on me!? Many years later, someone asks Lu Jin'an what kind of Dao heart supported him to get this far? Lu Jin'an glances at his charming and alluring wives and sighs faintly：“I just wanted freedom.”

[ Ding! You have successfully obtained the fiftieth Triling Ring ]

[ You now have access to enter the Mystic Cave guarded by the Nine Dragons ]

[ New Quest: Vampires approaching. Stop them from invading the Mystic Cave by ordering the dragons to protect you and your men. You have one week before the vampires reach the foot of the cave. Learn how to tame and control the nine dragons before they arrive]

[ Failure to do so will lead to your demise and all the fifty rings you’ve gathered will be a waste. The magical world will be destroyed and vampires will take over the land. You will be reborn in the next 250 years and would have to start gathering the fifty rings once again ]

*****

Rejected, due to being an human in the land of elves, Kevin was banished and casted into the river the very day he was born. But fate said he would live as he was rescued by the very person who casted him into the river.

Every mage when they reach the age sixteen were told to attend the mage academy and Kevin, the abandoned human who had overheard the conversation of some students, got excited to attend this academy.

He asked from his guardian if he could attend the academy but unfortunately, he was denied, all because of him being an human and not an Elf. At that moment, he became angry and had locked himself up in his guardian’s workshop, that was a room full of all types of magical items.

But while in the room, Kevin had spotted a golden ring that instantly glowed as soon as it touched his bloody fingers. Surprisingly, he was given a system that granted him the opportunity to be an Elf. But what he discovered was that, he wasn’t just an elf but a fairy and also an human.

.....

Jiang Che traveled here and practiced for eighteen years to awaken the sign-in system.“Ding, the host signs in to Snow Moon City, and is rewarded with the inheritance of the Drunken Sword Immortal!”“Ding, the host signs in to Peach Blossom Island, and is rewarded with the Tai Chi Xuanqing Dao!”“Ding, the host signs in to the Yin-Yang Family Residence, and is rewarded with the dual cultivation secret technique Yin-Yang Heavenly Immortal Technique!”With the sign-in system, Jiang Che traveled around the Jiuzhou Continent and stood at the top of the world step by step!Li Hanyi: “Legendary man, look at the sword!”Huang Rong: “Woo woo woo, Brother Che, please let me go…”Wanwan: “My feet are fragrant and soft? My brother-in-law is a pervert!”Jiang Che: “It’s over, the whole Jiuzhou Continent knows that I am a scumbag!”