MTL - Naruto: Ten-year-old Kaleidoscope, Opening Betrayal Konoha - Chapter 571

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.

He was the one who would become the greatest monarch in history.

“The spot you had climbed once, there’s nothing you can’t climb again.”

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In a world of Monsters and Mythical Creatures, he was reborn.

Not as a Human, but as a Monster.

'So you're telling me I can't leave this place?'

[You must first clear the Dungeon's Ten Floors.]

'Only then, will I be able to check out this new world?'

[You must build your strength.]

'By using my “Devourer” and “Evolving Monster” Unique Titles, huh?'

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“You never loved me anyway, did you?”---------------From the start, Lucy Grey knew her marriage was doomed to fall.She held onto her one-sided love for her husband for two years, but that was not enough to save their marriage.On the day Lucy was diagnosed with ovarian cancer, Landon stayed beside his first love at the hospital.Finally, she realized it was time to let go.On that same night, she signed the divorce agreement and left quietly.But fate dealt a cruel hand as Lucy found out she was pregnant!After three years of searching, Landon finally found her.However, when he stood in front of her doorstep, he never expected a child who looked exactly like him would adorably look up and ask, “Are you my daddy?”