When the Maho-Ii Siblings Arrive at the Holy Grail War

I transmigrated and transformed, but what the heck does it mean to become one soul in two bodies?

"Who the hell are you?!" asked Tohsaka.

"You mongrel, you have successfully caught my attention." Gilgamesh.

"My sense of justice is not wrong!" Kiritsugu.

"Why do you look exactly like me?" Illya and Shirou.

Faced with these questions, the siblings smiled with delight.

"Archer, Emiya Shirou."

"Caster, Illyasviel."

"Reporting for duty!" x2

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In short, this is a story about a transmigrator with the bodies of Illya from the Prisma Illya world and Emiya the Hero, seeking delight in the Holy Grail War.