Himitsu no AiPri Episode 21 English Subbed Episode Title: Secret Deserted Island / Aipri Summer Festival Episode Description: Himari and Mitsuki are still enjoying their summer vacation. But when they wake up, they are shocked to find that they, along with their classmate Mamiya Chii, are on a deserted island! There are huge dinosaur-like footprints on the ground. Are these the footprints of a giant creature that was supposed to be extinct...? Will the three be able to escape the island safely? Meanwhile, Mitsuba Airi of the student council is planning to hold an Airi-Pri music festival to make the last memories of summer vacation.