In the early part of summer, Aoi Matsuoka (Kasumi Arimura) is in the third year at a university. She doesn't like making trouble and enjoys the ocean with marine life. Aoi Matsuoka hoped to attend a different university, but because of her parents' opposition she gave up on the other school. One day, she begins work with students from the University of Marine Science and Technology at an aquarium near the sea.