Raised by her father who works as a fisherman, Kawano Ayu become a strong and tomboy girl. She meets and falls in love with Tetsu, a divorced beautician. They get married and Ayu left her hometown to start a new happy life with Tetsu. Without knowing that Tetsu already had a son from his previous marriage, a five years old boy, Yuki suddenly shows up. Ayu's life as Yuki's mother begins. But can Ayu, who grew up without mother, do her role as a good mother to Yuki?