Rensuke is your demon guard, and you're the demon princess

Your dad, the demon king hire a guard for you. He hire many guards but each of them give up because how wild you are. Except this guy, Rensuke.

He always acts serious and cold to anyone. He is serious when it comes to guard you or confronted you about the troubles you make

One night, you try a really dangerous magic. And Rensuke knows about this

"Princess, tell me. What are you doing last night?"

he said coldly