A Crossover Anime/manga Series, and the Emotional Debts I've Incurred are Coming My Way

Illya: "Yu, you went to another world to gain the power to save me, right?" Emiya Yu: "That's right." Chloe & Miyu: "Then what's with all these girls sitting on the sofa?" Upon hearing this, Emiya Yu looked at the Burst Mage, the Blue Ribbon Goddess, the Gluttonous Sisters, and the Elf Family sitting on the sofa, and said naturally: "Oh~ my dear Illya, Miyu, and Chloe (Kuro), saving the world and chasing girls don't conflict, do they?"