Secretive by nature, the group has never released a full member list, crediting different people for arrangements and music video production each time.
The only member reoccurring in all of the group's output is the vocalist and songwriter, an unidentified woman referred to as "ACA-Ne" (ACAね, Akane[2]).
ACA-Ne has never revealed her face, and the band have performed behind a translucent screen during concerts, including at the 2019 Fuji Rock Festival.
Attendees were handed opaque glasses and reported that the entire venue was dark for the concert's duration.
[14] The group released Gusare (ぐされ) on February 10, 2021, featuring songs "One's Mind", "Can't Be Right", "STUDY ME", "Hunch Gray", "Have a", "Engine Oil", "Darken", "Milabo", "Loneliness", "Crop", "Hypersomnia", "Fastening", and "Inner Heart".
In October 2022, the group provided the second ending theme, "Time Left" (残機), for the anime Chainsaw Man.