The four protagonist shipgirls discover there is another party scheduled to take place tomorrow night at a basketball court and they head there to practice. They discover Sirius still trying to practice serving her Commander but was hindered due to her clumsiness despite assistance. They encounter South Dakota and Massachusetts, who are in a similar situation as Sirius' as they are practicing for the piano duet. By tomorrow night, the grand party is at full swing. (thetvdb.com)