As Aizen in Naruto and Joined a Chat Group - Chapter 262: The Big Monster War

Three years ago, Yun Qing Yan fell into the Immortal Realm from the mortal realm. Three thousand years later, he became Divine Emperor Yun who shook the entire Immoral Realm. Breaking through the void and returning back to the mortal realm, Yun Qing Yan discovered that only three years’ time had passed here. “In the past, I did not possess the power to protect the people I hold dear. Now, I want the entire world to grovel at my feet.”

- Description from Novelupdates

[The Demon King is Dead], a story in which the Demon King got immediately killed in the Prologue. I became the ‘Demon Prince’ of said novel.

…Help me.

Igor had asked him to die for the world. She would ask him to die for her. Problem was, he didn't really like dying, not for a second time, at least.

After her mother’s passing, Tabitha Collins’s father marries a new wife and sends Tabitha Collins to live with a family she barely knows. There, she meets Alexander Foster, the family’s high-flying Eldest Young Master, who wants nothing to do with her. Apart from him, however, the other members of the family loves her and dotes on her. Soon, things began to change. Alexander Foster becomes intrigued by the mysterious and seemingly untamable Tabitha Collins. Who is she exactly? Initially, the girl seems to lack confidence and needs protecting, but as he finds out more about her, he realizes, he's the one with the catching up to do!