Escartin, Suirin, and Mina are representing SpoLuna at the SummerFest volleyball tournament. During the tournament, a Nipuru alien (trophy thief alien) disguises himself as one of the players and plays alongside with Escartin against Mina and Suirin. After losing a few rounds, Mina feels embarrassed and apologizes to Suirin. But Suirin reassures her that "victory is great, but its even better if you had fun earning it" Mina takes this advice and wins against Escartin but admits she was happier that she had fun rather than because she won. But afterwards, the alien reveals his true form and attacks. Mina transforms and fights alongside Ootsuki. But during battle Ootsuki reveals she enjoys battle and quotes Suirin's words about and enjoyed victory. Leaving Tsukishiro to ponder if Ootsuki is Suirin.
C'est le début du LunaFesta et une compétition de beach-volley est organisée. Cet événement met de nouveau en exergue la rivalité entre Mme Mutsumune et la lycéenne Tsukuda.
