*reader's discretion alerts, if you actually read the previous parts, you should have already known it.
Two hundred years ago, there was an upperclassman who practices black magic and was also a transvestite, he has a daughter who was in love with a lower-class man. The man did not allow his daughter to marry that man, which caused the daughter to run away with that man. Coincidently, the public theatre just done building that time and the first show was none of other but Romeo and Juliet, this enraged the father who just lost her daughter to a rural man. So he decided to ruin that act.
Days before that first act, he kidnapped the actress for Juliet that time, he ripped off the skin on her pretty face and exchanged it with his face using some black magic, then he joined the act pretending to be the actress. During the final scene he stabbed the actor of Romeo to death before casting a curse to the theatre and commit suicide. The curse causes the soul of the poor actor and actress of the act to be trapped in an endless loop of a certain scene in the act. However things don't just stop that way, the soul of that black magic man continues to haunt the theatre, whenever there is an act of Romeo and Juliet been shown on the theatre, tragedies would happen. Until one day, a powerful exorcist successfully seals that man's soul in a mirror and covered it with a cloth with spell and thus stopped the tragedy.
However after a hundred years later, people had forgotten about that deadly curse of the theatre. That day was another act of Romeo and Juliet, the backstage staff accidentally removed the spell cloth and thus breaking the seal placed by the exorcist, and she gets possessed by the man's soul who had already turned into a demon after all the years been sealed in the mirror. His pretty face he gets from the first actress had torn out into small pieces after all those years of torment, he. controlled her to poison the actress in order to get her face to replace his current face, however, his plan failed because the staff was actually a half spiritually gifted person, he was unable to control her effectively, after she poisoned the actress, instead of cutting off the actress's face, she makes a weak seal with her blood before commit suicide. However before she can fully seal that demon, he lured the actor of Romeo into the mirror and trapped him with himself. After that tragedy, the theatre was closed down for a long term.
"As always, stupidity doesn't just stop easily, a stupid Mayor bought the theatre and decided to do a renovation and thus, removed the seals placed by both the exorcist and the spiritual girl. The demon was once again been released, seeking for a new face, he hid in the mirror waiting for chances, but this demon somewhat had his own principle, he only target actress for Romeo and Juliet, and thus causing the three murder cases to happens, and as always, he lured and trapped the actors and of course the soul of the dead actress into the mirror with him, making them to went through scenes from Romeo and Juliet in an endless loop... "
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"But damn, his core is so hard, it takes me so long to break his form." said Sky to the police officer who is actually a member of Alliance. "Well, he was a two hundred years old demon that absorbed the power of that stupid angel... I mean exorcist after all." said Chris while taking out a small box of well-decorated cookies and show it to Sky with no intention to share with him. "I was about to ask why you are able to identify that demon so easily, but I guess I know the answer from Chris's unintentional clue." said Seito. "Seriously, who would have thought it's the same place? If I knew it I would not spend such a long time finding clues." said Sky. "Actually it's quite obvious just you are too dumb to realize it." said Chris. "Chris, don't tell me you know it since the beginning? Why don't you just tell me?" said Sky. "Huh? The most fearsome Immortal is asking for my help?" said Chris. "Ah... You are still mad about that." said Sky while doing some stupid face trying to make Chris happy but getting ignored by him as always...
"Wait a minute! If the soul of all the victims were sealed in the mirror, who was the one that having grudge with that theatre staff yesterday?" said Seito. "What? I thought that was a lie!" said Sky. "No it's not..." said Seito, then the two stared at each other with a frightened look.