February 2006, Shikina Island. Dr. Koto is riding his bicycle to visit his patients. He is told by one of them that Takehiro-one of the boys who was brought up on this island-has passed the entrance exam for a junior high school in Tokyo. The island is filled with excitement at the wonderful news. Meanwhile, the island's only nurse, Ayaka, is in Tokyo. She said that she is going to attend a rehabilitation seminar. But actually, she has gone to Tokyo for a medical examination...