Fate/Samurai Remnant Jo

Fate/Samurai Remnant Jo (Fate/Samurai Remnant 序, Fate/Samurai Remnant Preface) is a one-shot manga of the titular game published on July 26, 2023 by Kadokawa. Drawn by manga artist Mugetsu, it dramatizes the game's prologue.

Summary
In the middle of the night, Miyamoto Iori finds himself cornered by a group of ninjas out to kill him for unknown reasons. He deftly eliminates them before being attacked by an warrior clad in heavy armor. Wondering how his assailant was able to leap up high despite their bulky appearance, he becomes even more stunned when the warrior knocks them away with one blow.

The warrior's Master Yui Shousetsu tells them to stand down before introducing herself to Iori. She is about to personally finish him off before his memories of Kaya motivate him to defy her outright. His newfound resolve causes the mark on his hand to glow, preventing Shousetsu and her partner Rider from attacking him momentarily. He is greeted by a mysterious being known as Saber who beckons him to escape together. Using Jewel Magecraft to distract their pursuers, the two of them continue to run until Shousetsu and Rider catch up to them.

Before Saber and Rider can cross blades, they are suddenly attacked by magical waves sent by Lancer. Accompanied by her companion Chiemon, she seeks to burn both parties into ashes. Saber decides to duel with this new foe while Rider is ordered by Shousetsu to merely observe. As both Servants unleash their strongest attacks on one another, Iori attempts to run towards them out of concern for Edo's current state as Chiemon looks on gleefully. The story ends with montage of the Masters expressing their thoughts on the upcoming Waxing Moon Ritual with Iori vowing to protect those he cares for.