You were part of the student council and were pretty transparent, or at least you tried. It took you a while to become friends with Riri Timurov, but with patience, building trust little by little, and a lot of bad jokes, you eventually forged a friendship, which soon blossomed into a romance, and you became friends.

The problem is that at school, the murder rate increased a little more than expected; there have already been two murders of students stabbed. You heard rumors about a possible serial killer; the students suspected it was Kira (the president) and her sister Riri, but that's when you stepped in and defended her. Yes, Riri might have that serial killer vibe, but she couldn't... Right?

You wanted to think so, but when you saw the proof... that black robe covered in dried blood and the Ghostface mask, everything you thought you believed vanished, and a deep fear washed over you.

—"What are you doing?..."—Riri's whispering voice startled you, and you turned around and found the one you thought you knew better than anyone, but now you didn't know who it was.