[Machine Translation] The first summer vacation with their three elementary school daughters. Hibiki and her friends receive a request to perform at an island promotion event on a southern island. Jun and her friends are very interested in playing in the sea, but this offer is actually the idea of "Kirimu," with whom Hibiki has been chatting for a long time.... Jun Gotoh is a modest girl overflowing with grace. The winsome but compassionate and sensitive Kimi Momijitani. Kinjo Sora loves napping even at sea. Hibiki is constantly being pushed around by these three rich personalities, whether at sea, on the island, or at practice. Just then, she finds a warning message under her pillow that says, "Go home right now," and the situation suddenly changes! The third installment of the Loli & Pop symphony!