GJ-bu Temporada 1 Episódio 8

In the beginning of summer, Kyoyas 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 Kasumis friends sound awfully familiar...