Amina, Issei, Ryoga, and Akane were in the living room of the Hibiki household.
"Should I be here or should I go with Yoiko to keep watch over Ranko" Issei asked.
He wanted answers from this guy who traumatized one of his childhood best friends but also wanted to look over her too.
"This should probably be things that you need to hear as well given the reasoning Ranko is mostly still basically human at the moment" Amina told them.
"You do not mean that..." Ryoga said suddenly.
"The Wanderer is quick on the uptake it seems. Though given your role in everything it makes sense" she said
"What does she mean by your role in everything" Akane asked glaring at him.
"Same as your own role in everything, formerly Ms. Tendo" Amina told her.
She then went about showing them two images of which one was of Ranko and the other was of Ranma, at least as he was the last time he was seen by anyone nine years ago.
"Who are these two" the Egyptian Goddess asked
"One is Ranko obvious but is not that other guy the one that led to the complete destruction of the Nerima district of Tokyo" Issei said
"Ranma..." Ryoga started before Amina interrupted him.
"Ranma Saotome died in your last fight with him. He died and two different beings were born that day. The girl that ran off would eventually become Ranko and the what was left of Ranma would somehow merge with the Nermia Demon that merely calls itself Ranma. The memories of Ranma were absorbed and assimilated into the demon that gained sentience from this action" she explained.
She was about go then into further detail about how and why Ranko and Ranma the Nermia Demon were born.
"Sit down Mrs. Hibiki" Amina ordered Akane after she got enraged overhearing what Ryoga did almost a decade ago now
"He was not in his right mind at the time and neither was Ranma Saotome either. Both were influenced by the demon that was present under Nermia. One that merely took the strongest person in Nermia and made their life as chaotic as possible until they were truly beaten and then the curse would move on to the next person. Who knows when it started but the recorded know line goes. Tatewaki Kuno, Akane Tendo, Ranma Saotome, and the current one is Ryoga Hibiki" she said
As for her explaining what a Demon was and how they differ from Devils. That was be that Demon was basically just something that was not some kind of human, devil, angel, or god. A creature that could become as powerful as the dragon sealed within Issei's Boosted Gear. The one in Nerima was behind the craziness and chaotic nature of the place that only went into high gear because Ranma Saotome's father, Genma was crazy. He managed to create someone with demonic powers using a crazy person's attempt to replica her own fighting style.
"You are the origin of the Neko-Ken" Akane asked.
"Hell NO! What you all talking about this Neko-Ken as you call is an abomination that apparently some mortals thought they could do to mimic the fighting style of a god. However, it is just basically torture as it kills everyone who tries it. The people who created never succeeded in learning anything just died in the process every time" Amina explained.
"Then how did Ranma Saotome live long enough to be split into Ranko and the Nermia Demon" Issei asked
"I see you view them as two separate beings from one original source as well. They might all have a common origin but neither can be considered Ranma Saotome anymore after everything they have been through" Ranko's guardian explains.
Amina then went on to explain that Ranma Saotome never learned the technique that Genma was trying to force onto him. What happened was that a part of his soul became that of a demon back then. Luckily Genma assumed he learned the technique and they called the Neko-ken because they did not know any better at the time. Amina was not sure how or why Ranma Saotome regain his sanity and would only lose again when exposed to cats for too long.
As for the demon that lay slumbering under Nermia once it absorbed Ranma Saotome's memories that were forced out of him by Ryoga back when they were both under the influence of the demon. It gained sentience and assumed the name of Ranma having all of Ranma Saotome's memories but nothing else. This eventually led to the fight that Ryoga would have with him and why he fought him so seriously from square one where everyone else was taken back allowing the Nermia Demon to easily take them down. Though the demon has his memories it does not have the personality or anything else of Ranma Saotome.
Ranko is her own girl which is different from Ranma Saotome completely. That is mostly because she is only 3/4 human as a quarter of her soul is that of a demon. She left Issei when they were kids because she knew this instinctively and thus knew she had to do something about it even if she was not sure how at the time. Eventually, she was pointed in the direction of Egypt to go visit the Egyptian goddess Bastet. Who would give her the help she needed as she was told Bastet knew how to help Ranko get the results she wanted. It would also keep things so she does not become more demonic over time. There ware certain things that would cause her to lose control of her demonic nature which Amina had answers to thankfully.