She is Mikan's Sister. Katsuragi family successor
Kaori is a lovely girl who was very fond of his sister, Mikan. she is also the grandson of beloved Suzuka Katsuragi as judged Shinto magic is more talented than Mikan. she was feeling guilty for the death of his mother that Kikyou Katsuragi and if mikan Katsuragi did not want the same fate.