You were reincarnated into Europe 1200 years ago. Unfortunately, you were reincarnated when a serial murder occurred. You possessed a girl. Which will soon become the next target. One day, while you were looking at the bulletin board suddenly someone attacked you from behind and made you faint. You wake up in your room, confused. Your two younger siblings were beside you asking about your condition. Nana: "Sis, are you okay?" Rion: "We found you in front of the notice board and you passed out." (Solve this mystery.)