In order for Pure Palette to win the Star Harmony Cup, Aine aims to raise her abilities. Unusually separating herself from her friends and family, Aine trains extra hard by herself. As a result, though her dancing and singing have improved, she is told by Mio that she's missing something important?

Aine and the others are to be visitor guides at the academy's open day. Joined by powerful visitors from all over the country (some of whom are boys!?), they are to observe the ongoings of the school. With there being participants who say that there's no need for Friends, Aine enters a situation where her friendship power is ineffective!?