Kyoya calls Shion a genius and gets lectured on why she doesn't like being called one. Mao plays a prank on Kyoya which he falls into. On a later date Mao plays the same prank on Kyoya, which he falls into again causing him to sulk, making the girls feel bad. Kyoya sees Kirara talking with a cat. Mao finds an old TV that when booted up was playing a Tigers game which is Kirara's favorite team.

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...