The eight-member group consists of YUMEKA NOWKANA? NAMELESS, MOG RYAN, 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."

Starting with the "ACOUSTiC SAD ORCHESTRA TOUR" which began in May 2022, the band has become a seven-member group, with the addition of new members CCCCCC and RiON TOWN.

On August 27th, a one-man concert will be held 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 major 1st album "Terminal disease of ASP" will be released on October 2, 2024.
They will hold a solo concert at Nippon Budokan on October 8th.

Starting with the "Acid Suspicious Parental Tour" which began on May 3, 2025, the band has become an 8-member group with the addition of new member iKO MUGENNOKANATA.