The Lesser Grail had not been a secret since the last Holy Grail War.
According to the original story, Illya had ultimately died at Gilgamesh's hands, and even the Lesser Grail within her had been ripped out.
Although Gilgamesh in the Fourth Holy Grail War had ultimately been stabbed through the chest by Yoru Machi and fallen into All the World's Evil...
To be honest, Yoru Machi could not be sure whether he had actually died.
After all, according to the original story, the reason Gilgamesh had been able to linger on as a Heroic Spirit until the Fifth Holy Grail War was because he had been cleansed by All the World's Evil and thus gained a physical body.
Though Yoru Machi had stabbed him once more than before this time, who knew whether his Gate of Babylon contained anything that could save his life?
And considering the Type-Moon World's corrective force Yoru Machi had experienced last time, it would not have been impossible for Gilgamesh to still be alive.
Hearing Yoru Machi's warning, Irisviel immediately put on a grave expression. "Yoru Machi, do you know something about Illya as well?"
Irisviel had long since experienced Yoru Machi's immense strength and mysterious origins.
And the facts had proven that everything Yoru Machi had said so far had indeed come to pass.
That was why, when Yoru Machi said Illya would encounter danger in this Fifth Holy Grail War, Irisviel immediately took it to heart.
"I don't actually know much either. After all, the course of history has already changed. Just like you, Irisviel—you were originally supposed to die in the Fourth Holy Grail War.
Since you've kept... cough, cough, since you've provided me with food and lodging, I'll give you one more useful piece of information.
The King of Heroes,