Soyo Nagasaki

She is in charge of the bass and is a first-year student at Tsukinomori Girls' Academy High School. She plays the double bass in the wind orchestra. Always having a calm demeanor, she acts like a big sister, being kind to everyone and often relied upon by others. This makes her appear as a "kind and sensible person" to everyone. She has a habit of fiddling with her fingertips when deep in thought, but her fingers tend to move when her emotions are heightened, and she transforms when confronted with a hidden taboo. Anon calls her "Soyorin."

When she was in the fifth grade of elementary school, her parents divorced, and she was taken in by her mother (voice - Shiina Hekiru), which led to her changing her surname from "Ichinose."