Reborn as a Little Girl Demon Lord, I Don't Want to Be Hunted by Humans!

[No System + gender-bending romance + invincible protagonist + lighthearted] Good news: I’ve been reincarnated as a Demon King. Bad news: I’ve been reincarnated as a down-and-out Demon King. What is going on? Where the heck have I landed? Is this still China? Could life please give me a break this once? Why did I turn into a little girl when I’m a grown man??? At least they left me a Demon King’s castle. Wait! What did you say? A hero has broken in? No worries, I’ll just beat them to death! Revive the demon race? I’ll make it big by streaming and becoming a big shot in the human empire! Then no one will come to hunt down the demon race, right?