Hinata's younger sister. Unlike the frail Hinata who has just recently learned basketball, Kagetsu has incredible stamina and is a marathon runner in school. One snowy day, while asleep alone at home, she did not notice Hinata coming back from school. When she woke up, she was horrified to find her freezing with cold outside their door. She believed that it severely weakened her body, and blamed herself for it. Since then, she worries about Hinata whenever she engages in physical activity. When Hinata's team went to the beach, Kagetsu followed her there with the help of the school nurse Touko Hatano, and was shocked to see that their basketball coach is a high school boy. She was initially wary of Subaru, but toned down a little when he helped her mend her strained relationship with her sister. As of the latest volume of the Light Novel, Kagetsu has officially joined her sister Hinata's basketball team and is now in training as a Forward-Center.
