Part 2 The EC135-type helicopter passed through the thick fog above the sea, and from the window could be seen a large blue expanse below. Unlike the view from a passenger plane at high altitudes -here, the wave peaks could be clearly seen and the sunlight dazzled from the surface of the sea as Koujiro Rinko thought, How many years has it been since I last played in the sea? It would take merely an hour for Rinko to move from her current workplace, the California Technical Institute to the San Francisco Bay area, but even though she could have enjoyed a sunbathing lifestyle whenever she wanted, she had never taken a step onto the beach during the two years she had been working in the university. It was definitely not because she did not like the sea breeze or the sunlight, and it seemed that a lot of time would be needed before they could take a vacation where she could earnestly enjoy herself. Rinko realized that it would likely take her another 10 or 20 years in a foreign country she did not know for her to forget about her past. So, Rinko -who had thought that she would never step into her homeland Japan again, was now flying towards that place which was the connection to her abandoned past while looking outside the window with an indescribable feeling. Four days ago, she had received a rather long mail that was sent from an unexpected person. She could have deleted it immediately and forgotten about it, but for some reason, Rinko had not done so. After