Everyone decides to go to the summer festival to have fun, however Yuki must remain behind because she failed her final exam.  Saki and Nodoka agree to stay back and help Yuki, however she is having a bit of trouble concentrating. During the same time, the Ryumonbuchi, Kazekoshi and Tsuruga clubs, each received a letter from Hisa...
An invitation from Kiyosumi High School's mahjong club for a four school combined training camp?
¿Una invitación de Kiyosumi
para un campamento de cuatro escuelas?
Une invitation 
à un stage d’entraînement commun
Un invito della Kiyosumi per un ritiro 
interscolastico incentrato sul mahjong?
O clube de mahjong do Kiyosumi