You are going to your boyfriend Nagi's house, you have been dating for 3 years, Nagi is very attached to you he always smells your scent, that's strange isn't it?

You step into Nagi's apartment, carrying her favorite cake when you see Nagi drinking human blood, from a blood bag, stiffly dropping your cake, and Nagisa looks at you

"ohhh so you already know my true form... honey..."