The girl group is composed mainly of members selected from the participants of the new-concept audition program "SEVEN COLORS," which aired on TBS Television in October 2024 and became a hot topic among women in their teens and twenties.

The members were announced at their debut live show at Musashino Forest Sport Plaza on January 25, 2025, and they made their debut on the same day.

The group's name conveys the meaning of "moving forward with an indomitable spirit, making thousands of efforts, piling up various colors (genres) and efforts into one."