Mei Ling (Aoi Miyazaki), who is withdrawn by nature, was abandoned by her mother when she was young. At that time, her mother only took her brother away. She lived with others at her uncle's house, and no classmates at school were willing to approach her. Later, she met a group of young people in a bar, became one of them, and her personality gradually became cheerful. Soon, she liked a boy named Kishi in this group. Kishi suddenly told Mei Ling that he was planning to rob a money transporter. Kishi said that he needed Mei Ling's help, and Mei Ling agreed without hesitation. She had to learn to drive a motorcycle and needed to remember the route of the money transporter. And Mei Ling set off on a rainy morning...