Haikyuu: Zero To Almighty - Chapter 31: Friends with Volleyball

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.

Ethan Blackwood wasn’t used to being defied. As the CEO of a global empire, he crushed obstacles with a single glance. But when Lily Anderson stood before him, her chin lifted in quiet defiance, and something in him snapped. “Sign the contract,” he said, his voice like ice. “30 days. You’ll obey every command. After that, you’re free.”She hesitated, her fingers trembling as she gripped the pen. “And if I refuse?”His smirk was cold, but his eyes burned. “Then you’ll spend the rest of your life paying off your father’s debts. Your choice.”Trapped, Lily signed. But she vowed one thing: she wouldn’t let him break her.From the first day, their clash was electric. He demanded perfection; she gave him rebellion. “You think you can control me?” she spat, after he criticized her for being late.Ethan stepped closer, his presence overwhelming. “I don’t just control you. Lily, I own you.”But as the days passed, the lines between them blurred. Late nights in his penthouse turned into whispered conversations. His cold demeanor cracked, revealing glimpses of a man haunted by his past. One night, after a heated argument, he pinned her against the wall, his breath hot against her ear. “Why do you fight me so much?”Her voice trembled. “Because I’m afraid if I stop, I’ll lose myself to you.”Their connection deepened, but danger loomed. Secrets from Ethan’s past resurfaced, threatening to destroy everything. When Lily discovered the truth behind his obsession with her, she confronted him. “Was I just a pawn in your game? A way to settle an old score?”His eyes darkened with pain. “You were never just a game, Lily. You’re the only thing that’s ever felt real.”As the final days of their contract approached, their bond was tested like never before. Enemies closed in, and trust hung by a thread. Could they overcome the shadows of their pasts, or would their love crumble under the weight of secrets and pride?

Alex was just trying to escape his dead-end job and overbearing family. Then the System arrived, bringing with it magic, Rifts, and the chance for ordinary people to become extraordinary. Unfortunately for Alex, his stats started out as unimpressive as his old life. But when he gains the unique trait {Primordial Will}, which only allows him to put his free points into one stat, everything changes—though not necessarily for the better.Thrown into a dangerous Rift way above his pay grade, Alex quickly discovers that surviving the chaos isn't just about having powerful skills. He'll need every ounce of his Willpower and resourcefulness if he wants to make it out alive and bring home the rewards that could finally give him an edge.This series follows Alex as he begins to master the art of Mana Threads and creates a revolutionary new magic system with Spell Circles. He starts to realize that magic isn’t just a tool—it’s a path to power that few can fully grasp. But with the world’s governments struggling to contain the rising number of superhuman threats, Alex will have to navigate more than just monsters and Rifts. In a world where “might makes right,” who really calls the shots?

Lin Yuan traversed to an urban romance novel. His identity is a Gao Fushuai and he is also a villain. Fortunately, he can make choices to get corresponding rewards. Note- Gao Fushuai means tall, rich, and handsome (Mr.Perfect).