Yumi Maiharu (voiced by Reina Ueda) is a cute girl who has just entered high school. Although she is eager to ride a bicycle to and from school, she actually doesn't know how to ride a bicycle. Tomoe Akizuki (voiced by Yuki Hirose) is Yumi's childhood friend. In order to help her friend realize her dream, Tomoe decided to teach Yumi to ride a bicycle. In the process, Yumi gradually became interested in cycling. Shiki Mori (voiced by Sayumi Watanabe) is a teacher in Yumi's class. She loves cycling very much. Under the guidance of Shiki, Yumi entered this rich and colorful new world. With Higa Natsumi (voiced by Natsumi Fujiwara), who has a well-developed sports cell, Kamikura Fuyone (voiced by Takamori Nazumi), a naive girl who loves photography, and like-minded friends, Yumi rode a bicycle.