While running late to school, the bike of Yukari Tanizaki unexpectedly breaks down. She soon steals a bike of a male student, who is also late for class, and dashes toward the school. Chiyo Mihama is introduced to the high school homeroom class as a ten-year-old child prodigy, as she showcases her talents in making plush toys and cooking desserts. Sakaki, being a soft-spoken girl, is perceived as frightening to the others. Although it is revealed that Sakaki is fond of cats, a stray cat named Kamineko bites her hand on two occasions. An energetic Tomo Takino tries to challenge Chiyo and Sakaki in academics and athletics, respectively. Newcomer Ayumu "Osaka" Kasuga is nicknamed based on her birthplace, despite being totally different from the many cultural stereotypes.