KiraX

My theory is Ragna is not actually the Black Beast, and Noel actually it is. Nu and Noel, Ragna and Noel I thought actually merged. And based on my Theory, Nu, Noel and Lamda, are being made to merge not Ragna and Nu, for example. That's why I came to a conclusion, Ragna didn't became BlackBeast at the Past instead he lost his memories. I am sorry for putting an off-topic comment on my previous comment. This is it, Ragna, Nu, and Noel are being fused. But instead of Ragna becoming a Black Beast, It is Noel that drained the power of Ragna. Due to that aftermath, Ragna lost his memories. Actually, I didn't believe that was Ragna actually a Black Beast, I think it is Noel. And Noel is the Kusanagi, based on Suichiro's Log. If you still wondering if my post is necroposting, you can read the Novel again...

I already know that, have I told you that is just an Off-Topic? So there's no need to comment on that...

Not to mention, it is but my speculation. I am sorry, but I am offended.

AMATERASU, SUSANO'O, and KUSANAGI are belong to UCHIHA. I wonder if there were called TSUKOYUMI. Tsk...

Another thing, SUSANO'O unit is the armor he made to wield KUSANAGI weapon. The creation of Kusanagi failed so, he gave Susano'o to Jin. Hakumen is the one to be wield Kusanagi. Actually, Terumi made Susano'o for his possession. I don't know the reason why he didn't use that Susano'o for himself and why he used Saya for that project. Nox Nyctores that has power of Azure can also be use to KUSANAGI such as LAMBDA and NU. They were called MURAKUMO Units. MU-12 or MURAKUMO UNIT 12 is a major unit of murakumos that appear to be a KUSANAGI itself. Ragna's hand are similar to it, though it has a power of Azure. Lambda is his back-up plan if Nu-13 destroyed. Ragna became Terumi's counter plan for all Murakumo units that was destroyed.

Another thing, KUSANAGI is the Nox Nyctores that has Azure Grimoire. Azure Grimoire is a powerful force that can pull seals from the wielder. The thing used by ITACHI, SO, I WONDER BLAZBLUE MAYBE NARUTO'S FINALE CHAPTER. TSK...

Not only Ragna and Nu are falling in the Cauldron, but also Noel. Noel has contact to Nu-13, so instead of Ragna turning into Black Beast, it appears to be her. But how the Black Beast appeared twice? It is just a simple question. Actually, Ragna traveled through time twice. One is he falls into Cauldron with Nu and Noel. The other is with Noel, not Nu. (Calamity Trigger Final Chapter). That's why Ragna didn't appeared on that storyline. But, after the fall of the Black Beast, Ragna and Noel came back to the present time. (This is not opinion, It's a FACT). Other thing, Noel is the Nox Nyctores called "KUSANAGI". On the past, based on Suichiro's Log, it appeared that, KUSANAGI is the thing that they're experimenting, not the MURAKUMO. Murakumo is just a piece of Kusanagi, same that of a fragment that is on Ragna's. (REMEMBERING THIS TRIGGERED THE BATTLE OF ITACHI VS NAGATO, ITACHI SUMMONS SUSANO'O EQUIPPED WITH KUSANAGI)

On my opinion, Noel and Nu are the ones that actually merged and became the "Black Beast" instead. But, during the aftermath, Ragna lost his memories. It happened, because Noel leapt toward Ragna and touch each other, absorbing Ragna's memories. That is why he lost his memories and caused Noel saw distortions from her mind that she didn't knew whose memories are going through her brain.

On my opinion, Noel and Nu are the ones that actually merged and became the "Black Beast" instead. But, during the aftermath, Ragna lost his memories. It happened, because Noel leapt toward Ragna and touch each other, absorbing Ragna's memories. That is why he lost his memories.

Told yea, I am correct about the flow of a story. Now, I am raring to see this story on anime adaptation.