Shiori Sekine

Оригінальне ім’я: 関根

Sekine and Irie are best friends and both are in the same band formed by Iwasawa and Hisako. She is the bassist. She is not a gifted musician like the rest of the band members but gives her best. Despite that, Hisako always acts as her senpai and teaches her 'dos and don'ts' in a band.