Ep 7 - Clash! Cooking Sisters

Illya ends up competing in a baking contest against Kuro, winding up at a disadvantage due to one of her teammates adding bizarre ingredients. The next day, Illya tries to learn how to be regarded by Kuro as a "big sister", with not much success. Everyone also find out that Illya, Kuro and Miyu have the same birthday of July 20th. Later, Kuro states how she is relying on Illya to keep supplying her with mana.