What Bella and Elena are looking for is some information about forbidden magic.

In fact, it is precisely based on the information obtained from Officer Christopher, and after analysis, it is concluded that the prisoner may be involved in the study of dark arts.

And Mr. Murray has carefully analyzed the victim's wounds, and from past experience, it is surmised that this is definitely not an ordinary murder.

"But it's a bit of a coincidence." Elena suddenly said, "We were about to look for Gil Dryth's manuscript when it was stolen. On the way, I met Officer Christopher, and the recent case has something to do with the dark arts."

"yes, it's as if things are arranged, waiting for us in front." Bella agreed, "But maybe it's a coincidence."

"Yes......

"But when it comes to coincidences, things seem to be a little more complicated than we thought."

"What do you mean?" Elena was puzzled.

"Remember Officer Christopher saying that this isn't the first case of 'heart-gouging', right?" Bella said.

"Hmm."

"And the interval between each time is seven days—that's a week."

"That's right."

"Do you have any particular thoughts on the number 'seven'?"

"Huh? Is the number 'seven'?"

Bella nodded.

"Let me think about it...... Well...... I don't really like or dislike it."

"Is there anything related to 'Seven'?"

"It's related to 'Seven'...... Isn't it seven days a week?"

"Why is there seven days in a week?"

"Ah, isn't that what the Bible says?"

"In the Bible?" Bella is not a Christian and doesn't know much about it.

"Yes, in the first book of the Old Testament of the Bible, in the Book of Genesis, it begins with the story that God spent five days creating the heavens and the earth, mountains, rivers, plants, trees, birds, beasts, etc., and on the sixth day he created human beings, and on the seventh day, he felt that he was almost done, so he decided to rest for a day - a total of seven days." Elena explained, "So, it's seven days a week."

"That's right......" Bella looked thoughtful.

"What's the problem?" Elena asked.

"Ah, it's not a problem." Bella replied, "It's just that the 'seven' I know seems to be a little different."

"Huh?" Elena was puzzled.

"You know that a lot of things about life have to do with 'seven'." Bella said.

"Something about life?"

"Well, for example...... Do you know how long is the gestation cycle in humans?"

"This...... I remember, listening to Mrs. Frida, it seems like about two hundred and eighty days?"

"That's right." Bella nodded, "That's forty weeks. Although there are differences between different human individuals, most of them are around this time."

"Oh......" said Elena, "but what does that mean?"

"If it's just human, it probably wouldn't be anything." Bella continued, "But you know what? The gestation cycle of a rabbit is about 28 days, which is four weeks; Hamsters are 21 days, which is considered three weeks; Cats and dogs are around 63 days, which is nine weeks......

"Huh?" It was the first time Elena had heard of such a thing.

"Moreover, the incubation cycle for chicken eggs is 21 days, 28 days for ducks, and 35 days for geese......

"What do you mean—" Elena felt a little incredulous, "Does this 'seven' have any special meaning?"

Is it not just because of the Bible that it is specialized?

"Although I don't know the specific principle yet, it is certain that it must be related to some metabolic law of life." Bella said.

"Listening to you say that, it seems to make some sense." Elena thought and nodded, "And what does this have to do with the case?"

"If the prisoner has to get a living heart every seven days for some special reason, then, I think, could it be related to some mechanism of the human body? Or, to put it simply, is there something you want to achieve?"

"For what purpose?"

"I don't know yet, but it's certainly not a good thing." "Like the travelogue you just read," said Bella, "there were people who were willing to sacrifice three thousand boys and girls for the sake of immortality—though I don't know what happened to them—and it is not incomprehensible to persecute a few living people to have their hearts harvested for the sake of their desires."

Human greed is never-ending, and it can cause people to lose themselves and even act insanely.

Just like Gilles de Les did back then.

"Thinking about it this way, Gilles de Les also wanted to use the child's 'heart' in an attempt to resurrect the Holy Maiden. Is it true that the prisoner is also going to resurrect someone?"

"I don't think so."

"Huh? Why do you say that?"

"I've heard from Mr. Federico before, that in order to perform the forbidden magic of resurrection, Gilles de Les needed to get as much 'childlike innocence' as possible during the ritual. There is no such thing as a heart being harvested every seven days."

"But how can we explain the strange way of dying that Mr. Murray is talking about?"

"Well, it's possible that it has something to do with the lost manuscript, but it wasn't necessarily made to resurrect someone."

"This ......"

"There's a Persona here." Bella said, handing the book in her hand to Elena, "It contains some relatively unpopular knowledge."

"Oh?" Elena took the thick book and flipped through it in her hand, "What does it say?"

"There's an article in the book about vampires." Bella replied.

"Vampires?" Elena stopped what she was doing and looked up with a look of surprise on her face—not surprise, but a look of great interest when she heard something interesting.

"Yes." Bella continued, "There's a way to turn a human into a vampire?"

"From human to vampire?" Elena felt more and more incredulous, "Isn't it up to the vampires themselves to make their families?"

"In general, that's true. But if that's the case, the vampire created has a master-slave relationship, right?"

Equivalent to parents and offspring.

"Is there a way to change yourself?"

"I don't know if it's true or not, but it's mentioned in the book."

"How?"

"It is to consume a fresh maiden heart every seven days, and seven times in a row, you can transform from a human into a vampire on the last full moon night." Bella said, "Of course, there are some other rituals, but they don't go into details."