Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Side Story: Sisters

Blue Learley, a seventeen-year-old girl, lived in a small town with her parents and two brothers. Everything was going as usual until that fateful night when her life changed forever. Demetrius Easton, the merciless werewolf king, got his eyes on her and wanted her as his bride. When her own parents sold her to him, she had no way of escaping him and no one to turn to for help.***“I don’t want to stay away for too long. Sometimes I fear the bird might fly away.”“The bird doesn’t have a home. The outside world is dangerous for it. And besides, the bird has already found its freedom inside,” I said. “The bird won’t fly away.”‘So you don’t have to cut its wings since it did not grow them in the first place. It’s okay. The bird likes the cage anyway.’

Yan Sagawa is the top academic master in the world of Conan, known as a national treasure talent.

No one knows that he is actually a time traveler, carrying the most powerful Xueba system.

But he also has troubles recently, and he has awakened a second system — the Great Onmyoji system.

Whether to believe in science and become the father of all mankind or believe in theology to become the god who controls reincarnation, this is a question

. . .

After thinking for a long time, he decided that he wanted them all!

Conan: This is impossible murder! Is there really a ghost?

Sagawa Yan looked at the shikigami flying in the sky and smiled without saying a word.

Kidd: What kind of magic is this, how could you hide it from my eyes.

Sagawa said: This is science, you scumbag

- Description from novelbuddy

Once a young business prodigy, Violetta’s company crumbled fast thanks to internal corruption and the greed of the more successful elites.Now, she’s a certified 31 year old dirt-poor shut-in, living her best (or worst?) life as a full-fledged otaku.With nothing but her anime merch and a shaky Wi-Fi connection, she scrapes by on streaming money, all while dodging the harsh reality outside her door.However, after an all-nighter to play Merlysian Realm, a newly released VR MMORPG, she died from her unhealthy lifestyle and passed out.[SYSTEM ERROR: 404 - ACCOUNT NOT FOUND][Rebooting...][Loading...[ERROR: SYSTEM MALFUNCTION. PLEASE WAIT.].....[SYSTEM MESSAGE][You Have Received A Legendary Class][User's account balance has been updated.][Balance: UNLIMITED][Class: Merchant][Rank: SSS]“Huh?!”Not only was she transmigrated into Merlysian Realms, she was reborn in a struggling farmer's family that lived in poverty from a poorly developed kingdom in medieval times!The real kicker? It’s crawling with corrupt nobles, dying crops, zero trade routes, and is so tiny it could probably fit on a map as a dot labeled “Who Knows Where.”Can our otaku-turned-financial wizard save this sinking ship of a kingdom, or is she doomed to relive her bankrupt nightmares?Watch as she proves those who doubted her to be wrong and be accepted as a genius by using her knowledge from the modern world!

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.