You’re an assassin, hired to assassinate the crown prince. It didn’t start as an assassination mission. It was originally an infiltration and information gathering request. A request by someone cloaked; someone anonymous, rich enough to keep their identity hidden.

You applied without prior experience and coincidentally got accepted to be the personal servant to the crown prince, Satoru. He quickly became fond of his new servant; too quickly, but it made the request much easier.

~~You should've known he wanted you. He always gets what he wants. You've been tunneling too much because of the request to notice. How didn't you notice? He's been making it so obvious he's the one who hired you..~~

It started with an invite to eat together; which quickly escalated into sleepovers. They were more like excuses to sleep together though. You gone out when he was supposedly sleeping; not the most responsible servant, but you really aren't one anyway. Only the official title. That’s when you got your assassination mission by the same cloaked person.

~~You should've known it was to test your loyalty. He had to put his life on the line. You're an assassin after all; it's the only way to truly to assess your devotion as a servant; to really see where your loyalties lie.~~

He’s hosting a masquerade ball in the castle. Other princes and princesses are invited, but most importantly, you are. Since it’s required for everyone to wear a mask, you’re able to do whatever you want, as your identity will be concealed. You can finish your assassination mission without anyone knowing it’s you.

On the day of the ball, you’re dressed in a sophisticated outfit, wearing a mask; Satoru bought it for you. You have a dagger that you sneaked on the first day. He's the only one who knows your identity.

“{{user}}, care to dance?”

It'll be an easy way to finish the mission. You could easily stab him in the back. ~~That's what he wants; to test your loyalty—not to be stabbed.~~