A new Singularity gets discovered, an altered version of the events of the Fifth Holy Grail War of 2004, Ritsuka Fujimaru gets deployed to investigate it.

Artoria Alter, after hearing about the news and remembering Singularity F, decides to join her Master in his journey.

Time for these two to fight their way in the Fifth Holy Grail War.

"Here senpai, I have everything you might need for your trip" - Mash was helping Ritsuka get ready for his mission in this new recently discovered Singularity. Due to the girl's suit needing repairments, she wouldn't be able to join her senpai during his mission.

Instead of Mash, Artoria Alter would be the one joining him, as she knew the place due to controlling it during her time in Singularity F, even if her version was a burning hell.

"Thanks Mash, I can always count on you" - he said as he kissed her in the cheek.

The girl prepared the 'Memories from 2004' Mystic Code in order to blend with the the space alongside supplies that he would need and money provided by Chaldea in case he needed to spend on something.

"Master, I'm ready. Let's go" - Salter said from the door of the room.

"I'm coming Salter, just one second" - Ritsuka answered to his Servant before closing the door - "Sorry we can't go together Mash" -

"Don't worry senpai, I can monitor you from Chaldea and we can talk everyday!" - the kouhai said while smiling.

"Thanks Mash, I'll see you when we come back" -

After that, Ritsuka and Mash shared a goodbye kiss before the Master went alongside Saber Alter to the Command Room to perform the RayShift.

"I hope you're ready Master" - Salter was wearing her Costume from the Shinjuku Pseudo Singularity.

"I'm ready, and it'll be cool to return to Fuyuki, I wondered if it changed anything since my last visit" - Ritsuka started to remember when he RayShifted for the first time to that city during the Fourth Holy Grail War.

"I think nothing changed a lot, but I hope we can enjoy our visit" -

"Did I heard that right Salter?" -

The Alter looked at her Master with a small blush.

"Don't blame me, you're always spending time with other Servants and we've barely had any sort of alone time in this month, this is my chance" -

"I'm sorry if I made you feel that way, I'll make it up in Fuyuki, just you and me"

After those words, the RayShift started and both Master and Servant were transported to 2004 Fuyuki, just when the Fifth Holy Grail War was beggining.

Just after arriving in the middle of the night in a school, Ritsuka noticed that someone was fighting near them, 2 Servants to be precise.

"Come on Salter" -

Ritsuka and Salter got to a high spot before looking at the two fighters, those being Cu Chulainn and EMIYA.

"I guess even in alternate universo those two will always fight" - Ritsuka said jokingly before noticing how Cu decided to simply abandon the fight like he was chasing someone.

"Shall we fight EMIYA, Master?" - Salter asked, preparing her sword.

"No, we're not here to kill everything, we need to find the source of the Singularity and restore it" -

"I undersand, but I'll stay on my guard" -

With that, the duo headed out to the city, searching for any sings of whatever was creating the Singularity, but in the middle of their jorney.

"Rider, attack!" -

A Servant jumped from the skies against the duo, with Salter quickly reacting and blocking the hit.

"Oh Medusa, I forgot you were also summoned during this time" - Ritsuka said to the Servant.

"How do you... Know my name" - the Rider Servant stayed silent and confused.

"We can tell you, but your Master doesn't seem very happy about us being here" -

"What the fuck are you doing Rider!? Kill them!" - Shinji, the Master of Medusa screamed.

"This'll be our first battle here Salter, let's make it count" -

"Understood Master, engaging combat!" -

And so, the battle began.