Saving Persona 3 Protagonist from his fate as a seal for eternity was an easy feat for Shinji.
With that Shinji gained access to Sea of Soul courtesy of Philemon
Currently, they are in Philemon personal dimension
"Philemon what is the difference between Throne of Heroes and Sea of Soul?" Shinji asked
"Hmm, that was an easy question" Philemon amused "They are fundamentally the same, a place to record souls that has ties to humanity. The difference is Throne of Heroes is outside space-time while the Sea of Soul exists in the present space-time. Another difference is Throne of Heroes using the data when the soul still living and boost it according to its legend that widespread among masses, while Sea of Soul boosting and remodel soul data literally according to the masses impression"
"I am still confused" Shinji frowned "my cute knight-wife did you understand it?"
"I am sorry my king but I don't understand a bit" Edelweiss shakes her head
"It will be easier for me to give an example" Philemon hummed and his magic power comes to life "when are you recalling the tale of King Arthur what did you think?"
"An ideal knight in shining armor?"
Philemon shows an image about a blond king that using white armor that exudes an aura of gracefulness and nobility waving his hand at the screen while smiling from a field of flower that no doubt is Avalon.
"Ah, that was Arthur! " Shinji said in realization, even Edelweiss is shocked seeing a real living Arthur Pendragon
"If you use the Throne, Arthur will be summoned with that appearance and his capabilities boosted" Philemon explained "and if you summon using the Sea…"
A literal knight in shining armor appeared…
"A literal knight in shining armor" Shinji mouth twitched "So this is what you mean when they boosted literally according to the masses impression. Its armor just one step below a mirror in term of reflecting light"
"It was one of the reasons why the spell that persona use are usually fireball, wind blade, and many of its variation" Philemon hummed dismissing the Persona and producing fire in the tip of his finger using Agi.
"Because when normal masses think about magic, that was what they remember!" Edelweiss nodded in understanding
"I se-" Shinji responds cut by a crack in the Philemon personal dimension
"PhIleMoN!" A distorted voice coming from the crack, Shinji and Edelweiss is on guard, there only 1 being in Persona lore that becomes the ultimate enemy of Philemon with extension whole humanity
The Crawling Chaos: Nyarlathotep!
"Be at ease Shinji, Edelweiss" Philemon try to calm both of them "Nyarlathotep mean no harm"
"Oh? YOu HaVE a GUesT PhIleMOn? THaT UnusUal!"
From the crack an abomination appeared, Shinji didn't know how to describe it but if there is one thing that Shinji knows is that being radiated MaDneSS "Edelweiss, close your eyes!"
Edelweiss quickly closes her eyes, she trusts her husband judgment!
"OhH, YoU ArE a SMarT ONe!" Nyarlathotep amused "HeY TEll Me WhaT Did yoU tHInk ABouT KaMEn RIder?"
"Ehh, they are awesome? I especially like Den-O and Gaim" Shinji said on reflex because he has to fight the madness that encroaching his mind just by seeing Nyarlathotep
"Haha, take that Philemon! He is on my side!" Said a girl with long silver-colored hair grinned while slurping somekind of soda
"Where is Nyarlathotep?" Shinji asked confused with the appearance of the girl and the disappearance of the Nyarlathotep
"She right in front of you Shinji" Philemon sips his coffee that definitely didn't exist a second ago
"Wait, are you saying this girl in front of me is Nyarlathotep?!" Shinji is shocked "Isn't both of you supposed to be an eternal enemy or something? Because you are the exact opposite?"
"That was eons ago" Both of them answered at the same time "Now, we usually debate about kamen rider or magical girl. If you live long enough like us even our most hated enemy become a best friend"
"My image of both of you from my past life childhood game is starting broken…" Shinji speechless at the current status quo
"Don't worry we usually still fighting" Nyarlathotep replied "especially because this guy counterpart create Kyubey"
"...screw you Philemon!" Shinji cursed Philemon, anyone that watches Madoka know how screwed that world is with Kyubey running around.
Philemon has the decency to look ashamed "I admit that is not my counterpart best moment. Don't worry Kyubey is designed only can live in that particular world, just like how humans need air to live."
"Husband, can I open my eyes now?" Edelweiss asks timidly, the presence of Crawling Chaos will do that to you
"Sure my cute wife, just keeps in mind the silver-haired girl is Nyarlathotep" Shinji commented, chanting sutra to make sure his heart 100% not gonna deceived by Nyarlathotep human form that 100% in his strike zone.
Edelweiss open her eyes, even feel pressured by Nyarlathotep mere presence, she still cannot believe the girl in front of her is the same abomination a second ago 'My world view is really shattered, the worlds is really wide'
"Anyway, what world that you visit next Shinji?" Philemon asked knowing that Shinji didn't want to spent his time near Nyarlathotep reformed or not. She is known as Crawling Chaos for a reason
"A world with Gods and Demon that not too dangerous" Shinji replied glancing at Edelweiss that feel pressured by Nyarlathotep presence "I want to make Edelweiss get used by the supernatural. If she keeps pressured sooner or later it will become her heart demon, which will halt her progress in swordmanship"
---
{Nasuverse}
Rin feels she getting crazy, at first she didn't notice it and chalk it as a hallucination because of stress raised by Kirei but she no longer can feel denial because the voice in her head finally giving and undeniable proof
Rin used point that she accumulated because of her various achievement to buy random things from the shop. It worked, again, and again.
"Just what are you?!" Rin said frustrated, she buys Zeltrech jeweled sword blueprint as a joke but she really gets the blueprint. Her family effort for generations to recreate it being wasted just like that! "Are you perhaps connected to the root!?"
[I am Achievement System. Affirmative, I am connected to The Root]
Rin brain short-circuited
…
Somewhere in Mifune Town, deep in original Shiki subconscious, Void Shiki chuckled "Now, I know why The Second and Shinji love to troll!".
I just remember about Rin Achievement system and magus is a paranoid bunch. So I chalk it Rin starting to think she was crazy because raised by Kirei only to discover that the system is real and living. Next chapter in 1 hour XD!