A storehouse at the Emiya Residence. Irisviel inscribes a magic circle on the ground here to set up her atelier. Shirou uses the building as his workshop in Fate/stay night, and it is the location where he summons Saber. He was able to summon Saber due to the circle inscribed by Irisviel.

Fate/Zero Animation Guide I: Glossary of the holy grail war I