Iina and Aruto exhibiting their swimsuits gives way to a divergent concourse over whether Kokoro should be cute or cool extinguished by the arrival of a thunderstorm that threatens to make their vacation plans a moot point; fortunately, the storm blows over and the three sisters are on their way with poor Jun none too pleased to be stuck house-sitting the Library. Aruto inquires Iina the logistics of lodging during the vacation; while there is no financial cost per se, Aruto is not thrilled to have it explained that she has to do librarian work on her vacation and makes a break for the beach when Iina charges Kokoro a delivery -- a delivery to a housebound girl named Misato Fukami that wishes proximity with a dolphin. While Aruto's subterfuge backfires on her, Akaha explains Misato's prologue to Kokoro who decides upon a euphoric epilogue as she races home. Unfortunately, Kokoro's decision the next morning to lead the two cousins over to the cape where the dolphins are ignites a firestorm within Misato's family government along with her own for which Jun pays dearly; the silver lining is that Misato gets her wish twice over, while Kokoro learns that a good librarian makes her customers happy.