GReeeeN is a vocal group formed by four male members, HIDE, navi, 92, and SOH, in Fukushima Prefecture. All members hold dental licenses and conceal their identities to balance their music career with their medical professions. Since their debut, they have produced hit songs such as "Ai Uta," "Kiseki," "Haruka," and "Orange," with "Kiseki" holding the Guinness World Record for the most downloaded single in Japan.

In addition to their music success, GReeeeN has garnered attention for their lifestyle, inspiring books and movies like "Sore tte Kiseki ~GReeeeN no Monogatari~" by Narumi Komatsu and the film "Kiseki - Ano Hi no Sobito" starring Toma Ikuta and Masaki Suda. They have also achieved significant milestones in live performances, including a successful arena show at Saitama Super Arena in 2017 and their first overseas performance in Shanghai in September 2019. GReeeeN has further expanded their reach by providing the theme song for the NHK drama "Yell" in 2020 and making their debut appearance at the 71st NHK Kohaku Uta Gassen in the same year. In 2022, they announced a special nationwide tour featuring character designs by Eiichiro Oda, the creator of "One Piece," titled "GReeeeN and the Mysterious Great Escape." The group continues to captivate audiences with upcoming arena shows in Osaka and Tokyo in January 2023 and their largest national tour to date, the GReeeeN LIVE TOUR 2023 "The GAME."