Kachimachi Kosuzu

Kosuzu is a teenage girl with long brown hair styled into two side braids and pale pinkish-purple eyes. She typically wears the brown sailor-style school uniform of Hasunosora Girls' High School, accented with a vibrant yellow neckerchief and a collection of badges on her bag.

Resilient, hardworking, empathetic, humble, panicky, and spirited.

School Idol and student at Hasunosora Girls' High School

Coming from a large fisherman's family in Tsuruga, Kosuzu grew up being overprotected and felt she lacked any personal achievements. She joined the Hasunosora School Idol Club and the unit DOLLCHESTRA to find her own strength, inspired by her deep admiration for Sayaka Murano. She frequently shouts the phrase 'CHESTO!' to motivate herself whenever she faces a daunting new challenge.