In the beginning of summer, Kyoya's sister Kasumi comes to hang out in the club room. Mao convinces Kasumi she is younger than her and calls herself "Ma-chan". Meanwhile, the members of the GJ Club decide to go to the pool to escape the persistent heat... with Kasumi and her friends. The names of Kasumi's friends sound awfully familiar...
![Image Fate/stay night [Unlimited Blade Works]](http://i0.wp.com/image.tmdb.org/t/p/w300/3bI8db4tIPtgFY8mOqp3AB0YXGi.jpg?resize=300,450 "Image Fate/stay night [Unlimited Blade Works]")
