A six-member group consisting of NAMELESS, MATiLDER TWiNS, WONKER TWiNS, CCCCCC, RiON TOWN, and iKO MUGENNOKANATA.

She was unveiled fully masked on the final day of the WACK Joint Audition 2021, a training camp-style audition held in March 2021.

She made her debut in May 2021 with the release of her first album, "ANAL SEX PENiS."

New members CCCCCC and RiON TOWN joined the band for the "ACOUSTiC SAD ORCHESTRA TOUR" which began in May 2022.

On August 27th, they will hold a solo concert at Hibiya Open-Air Concert Hall.
They made their major debut on August 31st with Avex.

Solo performance at Hibiya Open-Air Concert Hall in December 2023 is SOLD OUT.

The first major album "Terminal disease of ASP" will be released on October 2, 2024.
They will hold a solo concert at Nippon Budokan on October 8th.

New member iKO MUGENNOKANATA joined the band on the "Acid Suspicious Parental Tour" which began on May 3, 2025.