MTL - My Iron Suit - Chapter 309 The building is fighting!

She, a renowned assassin of the 21st century, actually crossed over to become Su Manor’s most useless good-for-nothing Fourth Miss.

After Reincarnating into Naruto World at the Warring State Era as an Uzumaki, Masahiko thought that he got a useless System. He lived for 48 years as a normal, below average Uzumaki Shinobi.

That changed when he finally knew how the system works the day of his 49th Birthday!

- Description from Novelupdates

Su Cha transmigrated to a fantasy world, inherited a tavern, and activated a system! First mission completed

— renovate the taverns —

Lafite red wine formula rewarded, hundred times speed up in the wind cellular! Second mission completed

— served a hundred customers and received good reviews —

Budweiser beer formula rewarded! The third mission, fourth mission……

As the tavern expanded rapidly, not only did our MC bring in fine wine, he also brought in all kinds of cultural influences from the modern era.

This alternate world was starting to turn a little strange. Inside the tavern, the elegant elf queen fell in love with rock music, she picked up an electric guitar and started screaming and howling.

The orcs, the knight, and the sorcerer sat down at the table and started a round of Texas poker, soon getting all worked up against each other.

A famous wizard raised up his Budweiser beer and muttered, “Don’t ask how much I can drink, all I want is another gin!” …

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.