Tensei Shitara Slime Datta Ken (WN) - Intermission – Guy ? Crimson –

The Demon King dies and the entire Demon Realm perishes in the prologue of “The Demon King is Dead,” and I have become the Demon Prince of that novel.

… Somebody save me.

……………………………………………………………

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This crossing is so strange, death crossing, game crossing, etc. are probably barely acceptable, but why can you cross even if the fish tank is broken?

and actually passed through the magic tree in “OVERLORD” that is said to be able to destroy the world?

No! It is sad enough to regenerate into a plant. The protagonist, Ainz Ur Gong, the undead king, has also accepted the adventurer’s guild mission and wants to kill me!

I want to change my destiny! Live! I want to-surrender!

Ainz: Since he has accepted the job commission from the Adventurer’s Guild, deliberate failure is detrimental to the prestige of Ainz Ul Christine (the “surrender” button has been deducted)

actually died as soon as he crossed, but there is still a chance to return~ from the beginning of the magic tree to this world.

I must change my destiny this time! Live!

- Description from novelbuddy

In a world besieged by monsters, humanity's survival hangs in the balance. But hope emerges when every individual comes of age, bestowed with the chance to forge a bond with a hero. These bonds grant them formidable powers to combat the relentless threats lurking in the shadows.Enter Chen Ye, a newcomer to this tumultuous realm. Amidst a sea of aspirants, he discovers an unexpected trend: everyone gravitates towards heroes from the legendary series “One Punch Man.” While most covet the esteemed S-tier champions, Chen Ye discerns a truth hidden to others. He recognizes the unparalleled strength of the One Punch Man, a humble C-tier hero.Undeterred by societal norms and peer pressure, Chen Ye boldly selects the Saitama Physique as his ally during the pivotal graduation ceremony. However, his decision incites scorn and derision, broadcasted live for the world to witness.Mocked as a fool for his unconventional choice, Chen Ye retreats into a realm of silence, channeling his energy into rigorous training. Three arduous years pass, marked by relentless dedication and unwavering resolve.Then, as if scripted by fate, a transformation unfolds. The once-dismissed Chen Ye emerges not as a punchline but as an enigma—an indomitable force. Clad in the invincible guise of the Saitama Physique, he defies the very fabric of reality, rewriting the rules of engagement and carving his legend in the annals of history.

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.