Where All Beautiful Days Begin / Blue Archive x Undertale Fanfic
- Reads 4,108
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- Parts 10
MatureOngoing4h 26m
Last published Sat, Apr 18, 2026
Hundreds upon hundreds of genocide in the underground have passed, yet not a single soul could remember them. It was a cycle of awakening, dying, forgetting and repeat.
And the culprit was none other than that child, at least on the surface.
Occasionally, there would be a few differences between each reset. Once, two other judges were transported into the skeleton's world to fight the kid. Another, Sans went on a murderous rampage of his own to get stronger and defeat the kid. None worked out in their favour, however; the kid's determination always brought them back to life after death. It would always end in a reset of both the world and their memories.
However, this time, it was different.
Sans didn't wake up in his bed. Instead, he found himself awakening in what seemed like an endless canvas of sand.
Not only that, but it seemed all his memories from past timelines have returned to him.
"*just what is going on right now..."
----------
Notes:
I DO NOT OWN ANY CHARACTERS OF THIS STORY, NOR DO I OWN UNDERTALE/BLUE ARCHIVE. Sans, along with Undertale, is made by Toby Fox, whereas Blue Archive is made by NEXON Games.
- Sensei is still here YIPPEEEEEE (basically sans doesnt outright replace sensei but instead just is here alongside him)
- Will mostly be written in 3rd person, focusing on Sans and Sensei.
- There will be many parts of this story that doesn't happen in canon and is instead added in by me to A - Help develop characters and do a bit more world building or B - Create new stories that help keep your interest in the fanfic.
- Sans will be buffed HEAVILY. (In canon he'd probably die almost instantly in BA due to his low stamina and relatively weak attacks without karma; more about this in prologue.)
- idk abt romance in this novel lwk you can tell me whether or not to add it (im deciding ships tho)
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Chainsmoker [ Gaster!Sans x Reader ]
Routine. The entirety of every living thing is dominated by it, human or monster. Everything HAS to be the same. It was in this that you were the exception. For you everything was new, every time line a detailed altered in order to satisfy your sadistic desire for a new ending, whether it be only a few details of dialogue altered or something else entirely. Monsters you once considered family you now butcher and slaughter without a second thought, after all, that's what the Reset is there for, right? And all at once it stops. Your small hold over the Underground is ripped away from you and you are thrown into a dying timeline, monsterkind's final attempt at self-preservation. You're alone, completely and utterly alone. Except one. And he has a bone to pick with you.Complete
(I couldn't help myself, I like theses two games all lot so please don't judge and Frisk is still a girl, also Chara is going to be here as a ghost flying beside Frisk (they are a girl as well, she's a pacifist child too :) ) (Picture cover belongs to me) After All the monster's have been Free from the underground, the King and Queen, Asgore and Toriel, needed to have an ambassador on their side when having an Embassy. (Frisk is about 8 years old here okay) Frisk suggested if she could help them, but according to the country's rules, she's to young to be one. So that couldn't happen, Asgore and Toriel would have to leave with the people who made the rules to change it, so they had to leave Asriel and Frisk with Sans and Papyrus's, to take care of them at their new house. (All monster have new houses on the surface). As Sans turned on their old TV, he put on a old Cartoon, "Bendy And Boris Adventures". Frisk told them that, that Cartoon Used to be very popular back then, but she never new it would still be on to this day. As Sans and Papyrus left to get some groceries, both Frisk and Asriel had to stay inside of the house, both kids weren't sure why. But as they looked at the TV, continuing to watch the Cartoon, a knock was heard from the door, they opened it to reveal a old mail with black ink around it, as they opened it, it was pretty old, and it was signed by a person name, Joey Drew. Then a flash of light from the TV opened a portal, as they backed up, they were pulled into the portal. And as they opened their eyes, they were in shocked to be in a strange old building. Note: Looking back at this Yes I have noticed my many spelling mistakes and unnecessary long paragraphs, I could edit them but I'm too busy + lazy :')
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