Hiroshi and his friends are on their way to the island of Miyakojima, where they plan to go diving for the first time. Hiroshi is bummed that he won't get to dive with them today because of a fever, but he's also psyched that they're going to be able to see a sea turtle and a baby together in the water. They're also psyched to see the underwater tunnel at the aquarium, which makes Hiroshi want to be a part of it someday.