My Muscles Adapt 10,000 Times Faster - Chapter 122 - 1 Against 100!!!

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

When I cleared the final chapter of a game that was a national failure, I became an unnamed side character in it.

A non-standard, unmeasurable, EX rank supporting character.

Seven SinsSeven sistersSeven Arch-ParasitesSeven Host.Orion a late bloomer who didn't get a system was terrified as he couldn't accept it.But something happen, something he never thought in his life will happen.When one of the seven picked Orion everyone changed, Orion was now blessed with a system, why was he blessed?But again lust is one of the sins and he was here to be strong, revenge and conquer all the women in the world. Perhaps 100 lady in his harem, who knows 200.(ALERT)♥Unconscious host detected♥♥Host body damaged to the core, useless, but yet something can be sensed.♥{Scanning Host Body}♥Seven sins detected in host body.♥Compatible sin is Lust.♥♥ Compatible sin is Greed.♥♥ Compatible sin is Gluttony.♥♥ Compatible sin is Sloth.♥♥ Compatible sin is Wrath.♥♥ Compatible sin is Pride.♥♥ Compatible sin is Envy.♥{Initializing System Integration.}

A high-schooler who loves playing FPS games were reincarnated in the fantasy world. And usually, those who were isekaid were blessed with overpowered magic and a legendary beast. However, our main character is different.Instead of those things, he awakened a shop system where he could purchase American freedom! And since modern guns is as good as magic, he decided to make full use of this ability and make a name for himself in this new world.Fireball? Cute. My M203 grenade launcher makes a bigger boom.Summoned beast? That’s nice, I’ve got a UAV with thermal optics.You can split oceans with magic? Cool. I can erase cities with a nuke.Whatever overpowered spell you’ve got, I’ve got something better.