Kiyoka Kozume is Kenma Kozume's younger half sister who just moved back to Tokyo. For the past 15 years she had been living in the Miyagi prefecture and had been attending Karasuno school district. Kiyoka had been living with her father but after his death, she was forced to move back with her mother and her half brother in Tokyo. Now she starts her second year at Nekoma High School as a new student.