Script Breaker - Chapter 9: The Bug in the Story

I woke up only to realize—I'm in the middle of the Second Great Ninja War, just before the deployment ceremony!Year 32 of Konoha.I’m Uchiha Ryun, 18 years old, and a graduate of the same class as the Legendary Sannin.But with just a one-tomoe Sharingan and a few C-rank jutsu, how am I not cannon fodder?!Ding!The Strongest Ninja System has been activated.Complete missions. Earn massive rewards. Become unstoppable.Uchiha Ryun eyes lit up—“System, is there a newbie gift pack?”Ding! Newbie gift pack available…--------Naruto, Fan fiction, Uchiha

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!

Four years after the Third Nightmare, something unexpected happens. A group of people find themselves in a strange theatre, which tells them to react to someone's story...?

This is the story of Long Yi, who was killed because he took revenge for the girl he loved. Before he dies, a strange lightning carries his soul into a different realm. How will he live, when the first thing he noticed upon arrival is that, the man whose body he possessed is raping the country’s princess?

- Description from Novelupdates