Papa has long promised his daughter Mika that he will take her to the beach during summer vacation, but as a golf caddy, he keeps getting called into work when the weekend rolls around. This time, she even had a new inflatable toy she wanted to bring to share with her father and go swimming in the ocean together: A dugong she named Dudu. Unbeknownst to her, her father is very afraid of the water due to a childhood incident.