Little Glee Monster is a six-piece female vocal group from Japan formed in 2013 with a focus on leaving a lasting impression on people's hearts through their polished singing. They made their major debut in 2014 with "After School High-Five" showcasing powerful vocals and pristine harmonies, leading to various achievements including performing at the Nippon Budokan and supporting acts like Earth, Wind & Fire and Ariana Grande. Their success extended beyond Japan with their 2018 Asia tour and having their songs featured in commercials and TV programs. The group's latest activities include releasing the album "BRIGHT NEW WORLD" in 2020, participating in the NHK Kohaku Uta Gassen for four consecutive years, and launching a new chapter with the addition of new members in 2022.

In 2021, they released their first best album "GRADATI∞N" and embarked on their largest nationwide hall tour in June. Little Glee Monster then held the "M∞NSTER AUDITION" to recruit new members and welcomed three new members, launching a new phase with the release of the new song "Join Us!" and the successful "Little Glee Monster Live Tour 2023 Join Us!" in Tokyo and Osaka. They continued their momentum with the release of the EP "Fanfare" in March 2023 and announced the "Little Glee Monster Live Tour 2023 'Fanfare'" starting in April, along with upcoming appearances at events and festivals.