Summer vacation. Hina and her friends came to play at the beach. Let's go swimming! The four of them were excited. Then, Hina suddenly thought she heard something. （What was it? I felt sleepy...) （What was that? What is this place?) Hina woke up in a world she had never seen before. Hina's strange dream begins.

Summer vacation. Hina and her friends came to play at the beach. Let's go swimming! The four of them were excited. Then, Hina suddenly thought she heard something. （What was it? I felt sleepy...) （What was that? What is this place?) Hina woke up in a world she had never seen before. Hina's strange dream begins.