Misho and Robin travel to the seaside. Misho hurries into the sea while Robin wants to sunbathe. After exploring the seabed, Misho brings Robin a fallen star. When they agree it's a starfish, he returns it into the water. Next he finds a "sea chestnut" turning out to be a sea urchin. Finally, he brings Robin a beautiful shell, which turned out to have legs. And claws. It was the hermit crab that was responsible for Robin's first dip in the sea.