IQ99 is a five-member idol group that debuted on August 10, 2019, in Tokyo. The members are Aimai Mii, Strong Zero, Matsuyama Goma, Lil Barbie and Nyanhao Anzu. Shortly after their debut, IQ99 participated in the official pre-Olympics event Festival d’été ODAIBA 2019. In 2021, they rebranded from 9999.99-countstop- to IQ99 and collaborated with fashion brand KINGLYMASK. The group also held their largest solo live performance at Shibuya club ASIA, selling out 100 physical copies of their single "sadgoodbye". IQ99 made their major debut in September 2023 under Nippon Columbia, releasing their first mini-album, Twinkle Killer, which sold around 800 copies and peaked at number 11 on the Oricon Daily Chart. Their popular track "midnight parade" received national radio play. They followed up with their second mini-album, Attract Fullcourse, in April 2024, charting at number. 9 and featuring tracks used in TV and commercial campaigns. As their fanbase grows, IQ99 continues to push boundaries with nationwide tours and large-scale performances, including their 5th anniversary live show 5TART in September 2024. Their first full-length album Prism Party was released in February 2025.