In a beautiful ocean, there lived a young dolphin named Iroha. She had a bright blue nose that glowed. Other dolphins often laughed at her unusual nose.

It was Christmas Eve, and Santa Claus was visiting the ocean in his magical submarine to give presents to sea animals. But a thick fog made it hard for him to see. Just then, Santa spotted Iroha's blue nose shining through the fog. Santa asked Iroha to lead his submarine. Iroha happily agreed. Her shining nose guided the submarine through the fog. They passed sea turtles, jellyfish, and giant blue whales.

With Iroha's help, all the sea animals received their gifts on time. From that day on, everyone admired Iroha's special nose. Every Christmas, she would light up the ocean, leading Santa's submarine through the magical underwater world.