The main character of hentai Fujigasaki Miho lives with her father in a small town by the ocean. A few years ago she lost her mother in an accident, who worked as an oceanologist for a long time. Her father was the captain of the cruise ship “Northern lights”, but after the loss of his wife, he resigned. Of course Miho had seen and noticed that her father really wanted to get back to the ship to his favorite work, but could not due to daily obligations. She took over all the housework and pushed his father to action, and he did not resist and decided to return to his favorite business. Together with her friend Jun Moribe, Miho took a part-time job on a liner and went on her first sea voyage. However, she had no idea what a nightmare awaits her…