Jowamuši no imóto e (S04E04)

Thanks to sniping from Kuro, Illya's group managed to slip away from Beatrice and retreat from the Ainsworth mansion for the time being. Then they try to regroup at the school building Bazett and Kuro and have been using as their base. However, Illya couldn't figure out a way to counter their Cards: Archer (Gilgamesh), and Berserker (God of Thunder, Thor), leaving her dejected. Seeing her like that, Kuro suddenly turns her twin swords at Illya and attacks?! (Crunchyroll)