"Ah, umm... I made a puzzle, if you all want? So... here you all go, please take your time, I hope you all enjoy-..."
It was theater night for the movie 'Prince Yamato Take', and the actors are Sakuya, Alice, Seiga, Flandre, and Orin. Unfortunately, one of the actors was drugged. Apparently, Eri, a shapeshifter, and a master actor, has replaced one of the actors, with the real actor nowhere to be found. You were hired as a detective to investigate the scene.
Seeing as you were the one hired to investigate, Eri decided to challenge you by leaving little notes with nothing but a number at various places in the area.
The first note is located in the art room.
The second note is located in the lounge.
The third note is located in the inglenook.
The fourth note is located in the cafeteria.
The fifth note is located in the electrical room.
You immediately solved the case and figured out who he is. Who was it?