I think the reason Ver calls “Cain” his “Sun” is because as a vampire, he can only come out at night, hence, his Sun is the Moon.
Ken as Cain might have done something “evil” or “sin” against Ver when Ver was a child as seen from Ken’s dreams which drove him to kill Cain, assuming Cain is the God of the Moon.
But prophecies based on legends like this in stories usually have a twist. I have a feeling Agia taking the prophecy as it is and taking falling in love as an obligation or rather his salvation is going to be one of the major conflicts in the story,
1) Yeah ! It's a good remark, very interesting ! I hadn't even thought about it while it's super obvious! It's right Sun is what is missing for Ver to be "overpowered".
But, I find that that doesn't explain everything, for exemple : If there is a Moon, where is the Sun ? I can believe that the author create an entire "lore" , with legend and divinity, God of death, God of the moon, vampire... And there isn't God of the sun ? Knowing that there are two candidates ! There is necessarily ONE Moon, if there is ONE person being the Moon, what is the second person ? Aman Church is convinced that Isabel is the Human of the moon, so she is necessarily special and we know that Ken is also someone special, so what is Isabel if she isn't the Human of the Moon ? If she is human, not a vampire, what is she ? It's my interrogation and the reason why I perhaps thinks there is the Sun or a divinity, plus Aman. The author really insists on the parallelism between Ken and Isabel, there are all the times a comparison between them, their similarities and difference, without knowing each other, we know already that there is something strange with Isabel and her disappearance...
2) I don't know, I don't think Ver was innocent as a child. Like I said, I think Moon was naturally kind, innocent and care about humans. But his "sin" are : to be really naive and not realizing that too much trust, to want to save everyone and to believe that everyone has good intentions can lead to terrible disasters... According to what I read about Ken, it's totally his personality : first, he walks alone on the road ALONE, while he knows very well that vampires come out at night consequence : he is bitten, then he trusts about Agia so easily and wait to be almost raped to tell him STOP, plus there with this musician who is a musician, HE KNOWS that a powerful vampire search to have him but he wants to go to her, innocently. Ken forget dangers because he is totally unaware about his own situation and I would say that he repeats the same error that he did in the past. He talks kindly to everyone, Agia, his friend (this one who loves him), May, all in one way uses him like a "tool" somewhere and indirectly or not put him in danger to satisfy their own goal ... Ken let do that because he is kind, and too kind...
So I'm practically convinced that "Ken's sin" is an error due to his naivety, and his negligence, I think that Ver falling in love with him is a part of this error. Perhaps Moon shouldn't have be so close to him, and give him an extreme attention. I explain that Ken really care about humans specially children, I think that Ver is this children's case who touched the Moon from the deep of his heart, his pains a lot touched Moon so maybe Ver mistook it for love, whereas Moon gave him affection like a father or a brother...
3) I really think that the prophecy need to have Human of the Moon and Human of the death who fall in love with each other, and I'm persuaded that Agia doesn't mistook about this element. The myth is based on Aman, a perfect union between Moon and God of the Death, there isn't other option that this duality for me to accomplish this, it's literally said "The two cherished each other and would not be appart even for a moment" ... But you point out something very interesting : Also, I find Agia really strange... Like ... He's in a hurry, he does this in a way that is not at all natural, automatic ... I don't know it's really strange, but I don't have a good feeling, I also find that he does this mostly for his own salvation... But I don't think it's the major conflict in the story, one of the main, I agree but not the major ^^
I'm sorry for my bad english ~
I'm not totally agree. Yes, the fact that Agia is in hurry and seems to have "obligation" is real BUT I don't think that Agia is completely manipulating Ken, I think he really care about him and really loves him, but I think he mixes up his obligations to the church and his love for Ken. I really think that Aman Church didn't really understand God of the death's word, and perhaps the myth with monster and foolish human, death of Moon etc... either modified or caricatured, to make Ver the perfect "evil", Aman Church is like SUPER sus.... And I think Agia is completely manipulated by them..... And I'm not agree with the fact that Agia would have let Ken die if he wasn't Moon. Agia is not a bad person, he is not an angel, neither a recommendable, but I really thinks that Ken has something special, when he hugs him volontarily for the first time, ironically he did perhaps what the Moon did in the past : give affection to someone that nobody wants love, that nobody wants approach. I mean we are agree that Agia is a real asshole XD but Ken hugs him and "asks" (we can discuss about consent, because he was like "drunk") for his embrace, like a lover, like someone who really care about him, and maybe for us it's nothing "man, he was just ... Not in his right state..." but for Agia who seems to have a difficult past, with probably not parents who loves him... It can be a big upheaval... I think ?
I think that Ver refers to Ken/Cain as his 'sun' because as a vampire who lives at night Moon acts as the Sun IYKWIM?
Its mentioned that a creature (proto vampire) 'stole' the Moon Gods immortality and therefore he disappeared/died and that led to the Death God turning his back on humans. As Ver is the oldest vampire it stands to reason that he was the one who killed the Moon god, which doesn't make much sense as he apparently loves him. Ver said at one stage that Ken would abandon Agia again so there is probably a lot more to the story that we have to wait to unfold.
The prophesy said that the Child of the Moon and the Child of Death will be human, which makes me wonder of the child of the moon is a seperate person from Ken, as he is referred to as a God. Likewise, I'm not sure if Agia is human either, with his powers. Perhaps they are just born human and manifest later?
I wouldn't read to much in to the name, the Cain is an old name still used today with heaps of variations. The author might have just liked it and I doubt its linked to the story in any way.
Okay I have some theories. Sorry in advance for my mistakes because English is not my maternal language.
SPOILER.
1) My affirmation : According to the "Aman's myth", I think that Agia, is the god of death, and Ken, god of the moon. That's practically certain for me.
Argument 1 : The alchimy between Agia and Ken is SO obvious. Even if Agia is a little Sus (like he saws him, and BAM love at first sight ? Come on... No it's strange lol, but I think he feels something real for Ken !) Ken seems like ... Perfect for Agia and Agia perfect for Ken like... Yin/Yang, they are complete opposite, but they complete each other perfectly ! In Sex or real life, Agia is impulsive, violent and doesn't care about all the world while Ken is nice with everyone and generous and specially naive ..
Argument 2 : in the work it's said that God of death is impetuous and cruel, sorry but it's litterally Agia while Moon, and there it's more subtil, he calms him and loves humans.
Ken is exactly like this :
- in a lot of chapter Agia hugs him like to call himself (his sadness, anxiety etc...) (we can make a parallelism with Aman's representation where we have the big and tall God of death who had in his hand the little and luminous beautiful moon who is taking to him and if you remarks when Agia hug Ken this one always talk like "let me go", or other, I. The contrary, Agia is more occupied to keeps him in his arms like the representations of Aman), anyways, it's super interesting when we compare Aman and Ken/Agia ! Because all is symbolism.
- Then, Moon loves humans, I see that Ken naturally attract humans, and we see this especially we see this with children and his proximity with them, he seems really care them, and wants to him them affection, attention etc... Like a brother or a father. He really care about them and children like him. I think it's represent Moon's Love for humans, because children are the most precious humans : they are young, naive, and must be protected, must be loved to become adult, it's not surprising that Ken/Moon really care about them and in contrary that Agia hates them : link with his human past (see the raw) and with is past being the god of death !
2) the Human of the moon is the reincarnation of the Moon. Ken and Agia are God with human protection. They're are both divinity, it's explain why Ken would have memories of his past like his dream of Ver and he says himself that he did something bad, he uses the "I". And Ver says him that he is a god and that just doesn't remember of himself.
For Agia I don't really know, But I suspect he doesn't know what being human of the night and human of the moon imply. I thinks he doesn't know that he is God of death himself, if not I assure that he will not even obey to the Aman's institution.
If I'm sure that Ken is the god of the moon being the reincarnation of this one... Agia I don't know. Because in myth, it's implied that Moon died but not God of death.... He just disappeared in fact..and say that he will return when the human of the moon/human of the death are reunited. Here my theory : when Moon died, the God of the death is so devastated he provokes himself his own reincarnation of him and perhaps the Moon's reincarnation, because in raw we saws kid Agia so... It's logically an human and also Ver has talk about a unknown past where he did know him and even implied that their relation was perhaps different... it's confirm my theory.
3) Who is Cain ?
There I have a BIG problem. You could says me "Ken=Cain" it's obvious....
But I think and Ken is not Cain. Ok I explain what annoys me :
- Cain should be not a good person, in Bible Cain is literally the one who kills his own brother : Abel. AND THERE I have my theory but wait for this one minute, I didn't finish with Cain.
- All sign can convince us the Cain = Ken, firstly... Ken... Cain.. Ken ITS LITTERALLY THE SAME NAME XD I'm sorry but hahaha, its author wants to send a message I thinks he succeeded...
- And then Ver calls him Cain and seemed be sure about this ... (It's made my task difficult because Considering this like a mistake is complicated to explain).
- And Ken talks about a terrible errors, he did , in his past, perhaps something terrible.... Cain... The sinner.... Yes we have a lot of links yeah..
But let me doubt : Cain represent an EVIL character, not only someone who did a mistake because of ignorance, naivety... But someone who kills his own family because of his greed and jealousy. For me, it's totally not Ken, we see Ken like some naturelly nice, who love humans and bring joy, chance and love for everyone (God of death and humans). The symbolism doesn't match, we can say me "yeaaah but perhaps Cain is just a simple name and a far far away reference, but CAIN is TOO powerfull like reference to be just innocent... And it's too easy as conclusion, I thinks it's complicated....
For the errors that Ken did in the past, what made him culpabilize ... According to Ken's temper, we knows he is generous, naive and wants protect children, people in general... Perhaps that he fells responsible for a drame, a tragedy which concern Ver, he considers that this is HIS fault and responsabilité it's would explain the culpability... I think that Ken did an error by ignorance and naivety..'
Conclusion : ok there a complete speculation, my first question about Moon was ... Where is Sun ? Because if there is Moon I don't see why..' why Sun is not present ? While it's an entity which seems really important to me....
There my supposition :
- perhaps Ken has a perfect and identical twin, god of sun (Isabel perhaps ?) And that his him/her that Ver has meets and falls in love with them and not the Moon. It would explain "my sun" for example (but sun correspond also to Ken's description which is to be generous, representing joy and something brilliant, it's like a sun somewhere so I don't know it's strange...
- there also the possibility that Moon and Sun switch their identity, either consciously or one was lying for protection or other...
- Or perhaps aman's institution did an error it's not moon but sun which was loved by the god of the death... It's explain this luminous beauty and temper that represent Ken and also, Ver didn't precise what God Ken is..... So... The mystere is complete...
I don't what I can think, it's just speculation because I love theories haha my bad for my English ! (づ ̄ ³ ̄)づ