[Blazemaker]

Originally Posted by Rei-Tenshi

What do you guys think about this one?
I probably made a mistake here or there, but for the most part, I think the reasoning's solid.

Spoiler for Theory on the Culprit:

I'm not sure if this theory has been brought up before, but here goes:

Episode 1 - The killer is Rosa, I think. With the faces all destroyed on the 1st Twilight, Rosa could easily fake her own death. This theory also assumes that Maria is an accomplice. Since Rosa is the person who has knowledge about
Maria's notebook (being her mother and all), she might have been the one to draw all those circles (or maybe Maria did it).

This could also explain why Maria didn't give a damn when the survivors told her that her mother was dead. And also why Maria was happy to see 'Beatrice' at the end, since it was most likely her mother.

Episode 2 - The killer is Rosa, again. We see several suspicious scenes, like the part where Rosa is shown with the other siblings in the chapel before the 1st twilight. And only Rosa and Maria were there when Beatrice appeared.

Again, the magic symbols were present on the crime scenes.

The chase scene at the end is probably Rosa and Maria escaping with the gold from other people on the island who arrived on the island during the aftermath. (probably the police or something), but they surely were running from other people.

I focus on Rosa because she's the one who is hiding her intelligence and feigning stupidity. She also has the motive for killing her siblings (as shown on scenes where they bully her and hate her because she was stupid).

Episode 3 - The first killer was Rosa. She probably killed the 6 for the 1st Twilight, but was killed by Eva upon the discovery of the gold. This explains why there were no more symbols after the 1st Twilight (Since Eva doesn't know a thing about those symbols). Only the numbers 07151129 were used by Eva to add some kind of supernatural feel to the murders.

Eva is shown as the killer for the 2nd half of Ep3. No need to explain that one.
She probably followed the epitaph on a whim just to confuse the others and didn't know if killing in some way was "correct" like the epitaph states, as seen on the clues on the death descriptions of several people after Rosa died:

Rosa "She was the sacrifice for the birth of the new witch" (meaning a different killer)
Krauss "If only there wasn't that stupid epitaph, I wouldn't have needed a stake. What a pain."
Natsuhi "Why follow the epitaph in the first place? A game?"
Eva "From here on, a stake must be the finishing blow. How vulgar."
Kyrie "Is it OK to kill in a different way and stick the stake in the corpse?"

Spoiler:

I dont really like the ''Rosa and then Rosa/Eva'' theory it has some flaws...

We dont have red text for the first game, we just have alibis. And Rosa didnt have one because she was ''dead''.

In the second game...she could have been the culprit for the first and second twilights. She had no alibi for neither.

But here lies the first problem: In the majority of the killings that occurred after the second twilight, she had an alibi. She was in the lobby the whole time and Battler was by her side.

In the third game Rosa stayed awake all night with her siblings so she couldnt perform the first twilight...And you could say that Eva killed Natsuhi, Kyrie, Hideyoshi, Rudolph , Rosa, Maria and Krauss, but its impossible to say that she killed Nanjo.

So you would need one more culprit to make this theory plausive, but i guess that its not very close to the truth.

My bet is that if Eva killed someone it was Battler and only Battler.
And that she tought she was the culprit of the other serial killings ''because of the witch inside of her'' and went mad when discovered George body.
(Just like keiichi in tatarigoroshi who tought that he killed many people just by wishing their deaths)

Rosa is still fishy, she may be related to everything, but i doubt she is the mastermind.