Disclaimer: Both Neptune and Fairy Fencer Franchises are owned by Idea Factory and Compile Heart.
Also, any characterisation and inference from FFF is based on Vile God route, as that is the only route completed to work with at the time of this writing. However, general setting is loosely based on common route because story just mainly concerns a certain Lola.
Chapter 1: The Beginning of some Misadventures
It was just an ordinary day with nothing special whatsoever going on around Zelwind. Or at least it appeared that way anyway... Fang and his party were up to their usual fury search, except that it is not progressing very well because Fang is too lazy to move. Aside from that, on the outskirts of town there stood a little girl on a secret mission.
Walking to the Sol Plains was Lola, who had managed to gather information that there was a shrine underwater that can be accessed through a secret passage here. Being very careful not to alert any of the wandering monsters, Lola arrived at the specific point that was supposed to be the secret entrance. This place had no distinguishing features as it was the end of the river connecting to a larger stream, but because of that, this location was perfect for a hidden entrance. Still, nothing was going to stop Lola's search for information (and eventually, more money of course).
"I wonder if there are going to be any rare artefacts, those could sell for lots of money~" Lola muttered to herself as she prepared to dive into one of he latest adventures. Today she had magically sealed away her red coin purse (and keeping her precious money safe of course) since this was an underwater adventure, and of course Lola also have a proper swimsuit attire for this adventure as well. Being a fairy had its advantages of being able to change their clothes on demand as well as using magic to not needing to breathe underwater.
Naturally, most fairies who usually partner up with a Fencer do not use their magic for such mundane utility, but of course Lola was anything but natural. Being an informant meant that Lola had to use her own powers to achieve her goals and of course to make money even with unconventional means. With a simple wave of her lance, Lola activated her magic and her clothes transformed into a customised swimsuit: a standard sky-blue one-piece swimsuit in the shape of a dress with straps going over her shoulders while there are frills of pink on the lower end; additionally, her normal red shoes were replaced with a pair of blue sandals attached with a flower design along with a multi-coloured bracelet on her right arm. Lola's Blue bow on her headband and the red bow on her chest with the gold brooch remained unchanged though, since she still wanted some style while going on an adventure.
With all preparations complete, Lola magically leaped up and dove right into the intersecting point of the river and entered into the quiet underwater world. Just like the information she got from her fellow fairies, the secret passage was a big descent. Any ordinary adventurer would not be able to attempt an exploration of such a space without a fairy's magic.
Lola stabilised herself in an upright position and looking around as she reached solid ground in a vast space ahead of her. This place resembled the Kravisse Cave in shape and colour, except of course it was entirely under water and with more debris all over the floor along with a eerie atmosphere. The light from the surface was still able to reach this part of the underwater cave, and even when going further in Lola would have no problems since she had light magic.
Swimming forward, Lola scanned the area to make sure there were no shark monsters swimming around the area before proceeding forward at full speed. There were two paths branching off from the main area here, Lola went into the left path first and found... a dead end. Well, the ground in this dead end had a very suspiciously square floor with some markings on it, but they did not seem to be runes or anything special. However, she did see a two item crystals nearby, and picking them up she found... Two potions in one, and some canned food in the other. No big deal, potions can be resold at higher prices than the local stores while the canned food she can advertise as exotic food from a faraway land and somebody like Fang will definitely buy them. Backtracking to the previous area, Lola took the right path this time, and the path was not a dead end (thankfully) but a long path that stretched deep in. Sometimes the path way would narrow, but not too much that Lola would not get through.
One thing that Lola noticed as she swam through the bumpy rocky formations of this tunnel was that there seemed to be debris that seemed like it was from a building, or even a temple to be exact. Even more exciting was that the frequency of which the debris was on the floor increased as she went deeper, and eventually she also began to see whole pillars on the wall still intact. By Lola's estimation and the direction she went after descending, her location should be directly under the Sol Plains by now. Just a little further in, Lola then noticed a bridge, the design and shape matched the same one at Sol Plains. It was strange that there were no monsters here, but given the location of this place, it was definitely abandoned long ago, and this just means that Lola can loot any artefacts she can to sell for absurd amounts of money. Finally, Lola seemingly reached the end of the vast tunnel, after a bit of upwards swim, she found herself out of the water and onto solid ground.
Right here Lola noticed a structure that resembled a temple, with pillars supporting the structure on both ends while the door in the middle was wide open. She guessed that normally the edifice was white in colour, but many years of being abandoned left lots of grime on the area that darkened the colour. Still, the cleanliness of the area and place did not matter to Lola, what really mattered was making money from this adventure. Entering into the spacious and empty building, Lola began to plunder and loot anything she could find that might sell for money.
Meanwhile, in some other weird place known as the Hyperdimension...
Another typical day in Gamindustri, and another day where that nation known as Planeptune was busy with work. Yes, after dealing with some conflicts and restoring peace, it was time for the CPU and Candidate of this standing nation to get back to work. Unfortunately, there was much to do and after all the past fighting the motivation just was not there. Still, even in these times there are some people that are willing to throw in a little excitement into the otherwise boring scene. Bursting into the door of the basilicom room was somebody with long purple hair and dark coloured track jacket, and in her hand was her trusty Nep-Note.
"Heeey there, how have you been lately!?" Said the intruder, not even bothering to knock the door before coming in.
Sitting behind the desk with some paperwork was the person that is recognised nation-wide, the pudding-loving CPU of Planeptune, who recognised the intruder as her older-looking human counterpart.
"Oh, it's you... Well, I've been quite bored here actually..." Neptune replied, having been stuck at her desk for ten whole minutes, which felt like about ten years to her.
"Whoa, that's kinda a dull greeting, looks like you could use a vacation or two here," the Adult Neptune replied, noticing the unimpressed look on Neptune.
"Yeah I know, I really could use one. Especially after all the things that have happened. But you know, Histy won't let either myself or Nep Jr. leave until we get all this work done."
"Oh well, I guess you really need not to worry about this for now, because I just researched how to use Crostie's power to go into even more exciting dimensions than the one's we have seen. I was hoping you would have a moment to spare so that we can go on an adventure."
"Really? That sounds fun, we should definitely go on a vacation now!" Neptune said, with her eyes sparkling and she already sprang up from her chair and ready to leave.
"Wait a minute!" Said another person running into the room, belonging to a girl with long purple hair and a sailor uniform.
"Oh my Nep Jr. what's the big rush? We're just getting ready to go for a vacation, maybe you'd like to come along?"
"But Neptune, I just saw Histoire giving B-Sha a lecture for slacking off, if we do anything now, she definitely won't like it," Nepgear replied, worried that another case of shenanigans would likely not end well with Histoire.
"Hmhm, there is no need to worry this time. You see, when I looked into using Crostie's power, I can make it so that the time we leave and the time we return be about the same, even if we managed to spend days and weeks away from here!" Adult Neptune explained, very proud of her findings.
"But..."
"Well, who knows, maybe in these newer dimensions we go to, there might be robots too."
"Oh! That sounds great, we should definitely go!" Nepgear responded, completely changing her mind now that she hears the possibilities of exploring her mechanical hobby.
"Now that's what I am talking about, let's go to an open room and get some chalk, we will need to draw a few symbols here..." Adult Neptune said, leading the way to Neptune and Nepgear's room, where they began some preparations.
Surprisingly, the trio managed to avoid being spotted by Histoire while going around the basilicom, since Histoire was sure to be keeping an eye on everybody when Planeptune is behind with all the work that needs to be done. Nevertheless, the trio made good use of this opportunity and began to draw their magic circle.
"Now, listen up it is very important to draw this the correct way, otherwise I dunno what could happen.
So, little me, draw two circles then a triangle with two crosses inside.
Nepgear, draw five crosses and circle around them then put a square on all of them on the right side," Adult Neptune dictated the instructions to the Goddess siblings, who were unfortunately not listening.
"(Yes, a much needed vacation! I wonder what kind of pudding in the new dimension we'll find!)" Neptune thought as she drew three squares and then a circle with two triangles inside.
"(I get to use all the parts I can get and spend time with Neptune, and we won't get in trouble with the time either, this is great!)" Nepgear daydreamed in her thoughts as she drew five crosses with one triangle and a circle all on the left side.
Now, Adult Neptune did not even do a spot check on the magic circle as she was too busy preparing to use Croire's power, and once everybody was ready, they gathered around the middle. By now though, the three of them heard Histoire from outside in the hallway, and they pressed Adult Neptune to hurry.
"Oh no, Histy is here, we'd better get this going before something happens!" Neptune whispered, knowing that if Histoire saw them up to something like this, it would be bad.
"Yikes, I didn't expect her to appear so soon, all right let's begin!" Adult Neptune whispered back as the magic circle and her Nep-Note glowed with energy.
"Neptune, Nepgear. Where are you two?" Histoire's voice called out as she neared the room.
Before the door was opened, the glowing energy of the circle violently swayed left and right along with energy just pouring out of the ground. Adult Neptune immediately then took a glance at the obviously mis drawn circle and turned to the Nep sisters in horror. "Hey, did you two draw the circle corr-" she managed to say before a big BOOM erupted from their feet just as Histoire managed to enter the room.
With the resulting explosion that left a lot of dust around, Histoire called out again. "Neptune! Nepgear! What happened?" When the dust settled though, the only person Histoire saw was Nepgear sitting on the floor with a surprised look on her face. "What happened here?"
"Just... a failed experiment," Nepgear admitted, not really knowing what to say since both Neptunes were now gone.
