Idle Tycoon System - Chapter 174: Level 8.

(Naruto + Single Heroine Tsunade + Romance + Action)A failed author transmigrates into the Naruto world, becoming the younger brother of Konoha’s White Fang, Sakumo Hatake, and the uncle of Kakashi. He gains a cheat ability—enhanced cellular activity.Coincidentally, just before the Second Shinobi War, he participates in a Jonin meeting where he supports Tsunade's proposal ahead of Dan Kato, marking his first encounter with her.From then on, he launches an intense pursuit, winning her heart during the war.Tsunade: “Kawakaze, why do I keep losing to you?”Kawakaze Hatake: “Because I’d like to live a few more years...”Kakashi: “My uncle is amazing, I’m his biggest fan!”Kawakaze Hatake: “Keep it low-key, keep it low-key.”

I possessed the weakest character in a survival game. Before the game started, 97% of the viewers bet that I would die. But I am confident. Because I am here, this character will survive until the end. I know the information about this survival game. *** After working hard, I became the guild master of the No. 1 guild and one of the top rankers. I gained reliable comrades and allies. “Rudel, you’re a really good person.” Lilith, the beautiful female character who always trusts me unconditionally. “Let’s eat that deer.” Gio, the battle member who, despite being half-naked and always hungry, holds immense potential. All I did was strive to survive. But some wanted more from me. “If you don’t have anyone else in mind… you could accept me.” The No. 1 male character in appearance clings to me, nearly in tears. The hidden character and the only bug character in this game that I found- “Rudel, you are dazzling. Both in body and soul. Unlike me.” He looked at me with clear eyes as if I were the only person in the world. Everyone, please stop. I’m busy uncovering the secrets of this game.

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

When an S-class elite assassin-raised captain of a special ops suicide squad comes home from a high-stakes Africa mission, he finds himself offered something that could potentially set him up for life- a curious assignment that he could use to finally exit his days of war and slaughter.

Then placed into a high-school setting, Lin Yi is tasked by the chairman of a top-tier multi-billion company with bodyguard duty for non-other than his own daughter, a certain little Miss of said high-school.

His enemies, once ranging from drug lords, mafia bosses, political figures, and national leaders, are soon replaced with spoiled kids who happen to have rich papas and mamas, and Lin Yi finds his intense expertise and high-threat skillset misused, and very underwhelmed…

But he does get a harem cast as diverse as his old enemies, so Lin Yi decides that, for the sake of messing around with girls as an invincible entity in a down-leveled environment, leaving his bloody and death-filled war days behind is something he’d definitely want to strive for.

- Description from Novelupdates