Hinako Nijikki

Drummer. Usually high-spirited, she often gets scolded by the staff at the music store where Rei works for being too noisy, but she is told to stop making noise during live performances because it ruins her image. She also gives people unique nicknames like "Twinkle Star Kasumi-chan" and has a unique worldview known as "Hina-chan World." She has a habit of imposing excessive physical affection on her friends and juniors.

She often gives advice to the band, so she is acquainted with Natsuki and knows that Saya used to be in a band.

Kasumi calls her "Senior Hina-chan."