Wait, How Did My Digital Girlfriend Become a Sword Immortal? - Chapter 657: Formation!

Jiang Chen accidentally traveled through and started his comprehensive journey.

The world is tentatively scheduled: Naruto – Attack on Titan – Blade of Demon Slayer – Sword Art Online – Detective Conan, etc.

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In the Naruto world, Jiang Chen obtained the apprenticeship ten thousand times return system, as long as he taught his apprentices, he could get a correspondingly high return reward.

As a reward, Jiang Chen taught Hinata the black coffin he brought from the world of the god of death to Hinata.

During the Chunin Exam,

Neji: “Abstain, Hinata, you are not fit to be a ninja.”

Hinata: “I don’t want to run away, Brother Neji, let’s have a showdown! The turbid coat of arms is faintly revealing, and the unruly and arrogant talent… The Ninety of Destruction: The Black Coffin!! !”

Everyone: “You call your brother on the lips, but you actually kill him. This girl is too scary!”

(The introduction is weak, please move to the text~)

- Description from novelbuddy

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.

ROMANCE! APOCALYPSE! DRAMA LOVING GOD! REBIRTH!The hospital lights buzzed faintly above her, the edges of her vision already blurring into white. Blood pooled in her lungs. No family. No friends. Just the relentless beeping of a monitor counting down her last seconds. Rosalie stared at the sterile ceiling, tears sliding sideways across her temple.“I didn’t even get to do anything.” She whispered. “No love. No one will remember I was here. If anyone’s out there… God, fate, whatever you are, hear me. Let me live again. Somewhere. Anywhere. Let me matter.”When she woke up again, she wasn’t Rosalie anymore. She was Mei Shen, a forgotten noblewoman trapped in a story of cold nights and cruel tyrant hands. One night. No promises. A pregnancy with a tyrant's child. She ran. Hid. Escaped fate’s cruel grip.But less than a month later everything changed.“Subject detected. Lianwei Voss has entered your proximity. Obsession level: 85% - critical. Imminent event : Apocalypse countdown initiated -time remaining: Unknown. New genre unlocked: Dark romance -Obsession + villainous devotion activated.”The game had changed. The rules were gone.“You broke the script. But you will never break me.”God whispered in her ear.The child she carried was a weapon, her vengeance a fire. And somewhere in the darkness, the emperor’s obsession burned hotter than ever.One night, beneath the empire’s broken skyline, she found a stranger, broken, bleeding, unknown. She saved him. Not knowing she was cradling her own nightmare.

Roy died during a war against the Evil God Cult, but somehow, he returned back in time to 30 years in the past where he was just a boy who awaken his summoning magic.