Narukami Chizuru

A second-year student who is a member of the string orchestra club, and in charge of the 2nd violin. Souta's younger sister and the daughter of the president of a famous company. Chizuru is hotblooded and takes everything seriously. Due to her hardworking nature, she is always at the top when it comes to her studies.

Chizuru is not only Nao's childhood friend, but she also regards her as one of her best friends and rival. Though she keeps a poker face on at most times, Chizuru has a soft spot for both Nao and Riria - though she tends to scold the latter sometimes.