Mukai continued performing as both a solo artist with his "Mukai Shutoku Acoustic & Electric" shows and formed a new band, Zazen Boys alongside drummer Ahito Inazawa. In 2005, Inazawa left Zazen Boys to form post-punk revival band Vola and the Oriental Machine and later joined BEYONDS. In 2010, Mukai formed another band called KIMONOS. Toshiba EMI released several posthumous Number Girl recordings under the title "Omoide in My Head", consisting of a best-and-b-sides collection, two comprehensive live volumes, a three DVD set consisting of the band's two earlier live albums, and a rare tracks collection. The band made a surprise announcement in February 2019 that they would be reuniting with the original members to re-form the band. Their first live performance will be at RISING SUN ROCK FESTIVAL in August 2019, with future activities yet to be revealed. Mukai's comment on the band's official website explains how the reunion came about. "I was drunk one day in the beginning of summer 2018," he shares. "And I thought, I want to 'do it' with them again as NUMBER GIRL at Rising. I also thought, 'I want to make money.' I was drunk." Number Girl website posted a gig schedule which is titled "NUMBER GIRL TOUR 2019-2020". Number Girl's style prior to signing with Toshiba EMI was a brand of indie rock influenced by 70s punk bands such as The Ramones, as well as more contemporary band The Pixies. Although many of Mukai's influences, as diverse as Led Zeppelin, Prince, Miles Davis, and Public Enemy, would not emerge until after Number Girl's demise, his bandmates' combined musical tastes would serve to define much of Number Girl's sound, despite Mukai's clear role as the creative force behind the band. Nirvana is credited as inspiring Nakao Kentarou to begin playing music, but his aggressive, distorted basslines resemble 1980s hardcore punk, such as Hüsker Dü. Tabuchi's mostly melodic lead playing was contrasted by frenetic noise rock sections, obviously inspired by Sonic Youth. Inazawa, often regarded as one of Japan's best rock drummers, was inspired by new wave bands such as The Police and Talking Heads, although these influences would seldom emerge prior the band's final album. With their 1999 release, "School Girl Distortional Addict", Number Girl moved towards a much heavier sound somewhat reminiscent of post-hardcore.