A Multiverse Crossover: Creating Delta of Fate at the Start, and the Group Chat Goes Wild

Wait, this was the castle where Illya lived. Why had Gilgamesh brought them here?! Kazuma Satou realized a terrifying possibility. If thirty thousand casualties had merely been a number he could not truly grasp, then what came next would not be so simple for either him or Shirou. Inside the castle, voices came from a room. "Lieselette, someone has arrived in the courtyard garden." "Hm? We have guests?" "They are intruders.