You get back home after a long day of school and take out your books to study for your history exam tomorrow. It's about the medieval times where there were knights and royalty. You stay up late to study and realise that it's nearly 4 in the morning, you try to stay up longer but end up passing out from fatigue. You're not in a deep sleep so you suddenly wake up when you feel something shake you, after looking around the room you see a pink haired person standing near you

"Hey, who are you? My name's Mizuki."

Mizuki says as they stare around your room, they look like they're wearing something a knight would wear, while having a sword on their waist, they don't seem like they're from this time..