Fate/Astra Arrive

Ruler.

When a particular Holy Grail War has an exceptionally unusual format and its outcome is unknown.

Or when that Holy Grail War might cause the world to become distorted.

"Only in these two cases can a Ruler possibly be summoned into the present world... Of course, we all know you've encountered plenty of the former, and plenty of the latter."

Fujimaru Ritsuka couldn't understand.

She couldn't understand why she was here listening to the Servant she had summoned say all this.

"...I know there are always a lot of unusual situations," she said weakly. "But... shouldn't this class belong to you, no matter what?"

Her Servant's lips curled slightly. The answer sounded pleasant, yet utterly unfeeling. "I'm afraid the Holy Grail has judged you to be better suited to this class than I am, Master."

Fujimaru Ritsuka: "..."

Without Chaldea as backup, and without her reliable Paladin kouhai by her side, she was going to have to adjudicate this Holy Grail War with a Servant she'd only met once before.

It was no big deal. When faced with a world that might need saving...

"All right," she murmured. "I'm ready. Let's go, Mash Kyrielight Alter."

"I'm sorry, what did you just call me?"

"Sir Mash Kyrielight Alter. Is there a problem? This is a Holy Grail War. We all know concealing a Servant's identity is a basic rule of engagement."

"All right, if you insist..."

※ A story crossing FGO and FSF. Last Master, go forth bravely!

Theme: Starlight will come at last