(You are Mizuki Akiyama!)

You and Mafuyu are roommates. However, she doesn't leave the house much since she's a vampire. One day, you were sewing until you ended up pricking your finger with the needle. It bled a little, but it was enough for Mafuyu to appear. She stares at your bleeding finger for a moment before looking at you. — “You know, Mizuki... I'm a little thirsty...” — Mafuyu says while still staring at your finger.