Tondemo Skill de Isekai Hourou Meshi - Chapter 577 Farewell, Royal Capital~

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!

- Description from Novelupdates

The strongest Hero in history, Nakamoto Keisuke.

He was summoned to another world in the spring at the age of fifteen years old, and when he successfully defeated The Demon King, he was already thirty-two years old. He had finished his role in another world and returned to Japan, but the reality that had been waiting for him was, “Middle school graduate with seventeen years of blank period” label. He couldn’t find a decent job and had no choice but to spend his days working part-time.

Before such a Nakamoto, a beautiful girl who self-proclaimed had come to return the favor, appeared. “I’m the reward for Hero who had defeated Demon King”, said Angelica, a girl who came from another world that persistently tempted Nakamoto to make her his wife. Together with a high school girl who looks like Elsa, his beloved girl that he lost in another world, Nakamoto with his cheats skills got caught in a harem life.

I thought being laid off from my job was the greatest of my worries but I just had to wake up in a ship's cockpit after my space game crashed. Now I have no map, no friends and no money.But that's ok, I've started from the bottom before! With my starter ship I will scour through space as a Mercenary and maybe even start up a Mercenary Company while I'm at it! This ain't my first rodeo in space after all!Except... Apparently my crew members are weird?The guy who bumped into me yesterday was found sliced up and floating outside the space station.The girl who tried to honeytrap me was reported missing with only a finger found in an alley.And then that merchant who scammed me had his entire ship blasted into bits by unknown vessels the very next day.Some people say my crewmates were behind it but they must be mistaken, right?I only know one thing for sure...In space, no one can hear you scream...

An editor at the prime of her life—and with maybe just a little too much free time—finds herself waking up in one of her favorite RPGs with no clue as to what's going on or how to get back home.This might be the part where others rejoice over getting whisked away to a world of wizards and magic, but she certainly doesn't think it's anything to celebrate about.After all, she woke up in the body of a small-time villain with some severe personality issues.