The girls have a sleepover in preparation for a trip to the beach, only to find it raining the next morning. Not wanting to put their new swimsuits to waste, the girls decide to spend the day wearing them indoors. After being joined by Hiroe and Shion, everyone goes to a resort hotel pool, where the girls teach Hana how to swim while Hiroe and Shion get a massage. Later, the girls discover they forgot to bring underwear with them, so Shion offers some replacements.