This is really not mechanical ascension - Chapter 23 - : Soaring Development Speed

In his past life, Ethan Steele was an ordinary man living in a modern world—working a dead-end job, struggling through the monotony of daily life, and haunted by regrets of missed opportunities.At the age of 23, his life came to a sudden, unexpected end in a car accident. As his consciousness faded into darkness, he was sure it was over.But fate had other plans. In the divine realm, the God of Fate watched over the balance of life and death.Ethan's untimely death was a mistake, an anomaly that diverged from the preordained path of his destiny. It wasn't yet his time to die, and so, the god decided to give him another chance.“You were meant for greater things, Ethan Steele,” the god's voice boomed. “To correct this error, I will reincarnate you in another world—one filled with magic, swords, kingdoms, and adventure. You shall be reborn, but you will not remember your past until the appointed time. There is, however, a... complication.”By divine error, the god accidentally bestowed Ethan with the Harem God System without having any idea about it.This system is a powerful, reality-bending system that would allow him to charm and seduce influential women to build his harem, growing in strength and power with each conquest.“Your memories of Earth will return on your seventh birthday. I hope you enjoy your life here in this world”And with that, Ethan's soul was transported to a new world.

Brian had just been confessed to during his sky-diving adventure which turned tragic.Now dead and presented with the choice of a world to reincarnate into he chooses the Naruto world with Kaguya's abilities.═══════════════════════│ DISCLAIMER │This is a work of fan fiction based on the *Naruto* series. All characters, locations, and settings from *Naruto* are the property of Masashi Kishimoto, Shueisha, Viz Media, and their associated rights holders. Additionally, this story contains references to characters and elements from other anime and manga series. I do not claim ownership of any copyrighted material used in this fan fiction.The plot and any original characters are my own creation. This work is purely for entertainment purposes and is not intended to infringe on any copyrights or trademarks. Please support the official releases and the original creators by purchasing or legally accessing their works.

A failed investor from 2017 got drunk and woke up in the 1980s. China is just opening up, and the economy is blooming. There is also the dissolution of the Soviet Union, the bursting of the Dot-com bubble and other financial crisis. He used his knowledge of the future and slowly build up his empire.

- Description from novelupdates

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- Description from novelbuddy