CY8ER was a dynamic Japanese idol group, known for their electric presence in the J-pop and electronica scene. The group was formed in 2016 by producer Koinuma P, initially starting as a duo named BPM15Q with members Ichigo Rinahamu and Nicamoq. The unit was rebranded to CY8ER in January 2017, following Nicamoq's departure, and expanded to include additional members Koinumaru Pochi, Fujishiro Anna, Yamai Suzu, and Yamiyume yAmmy. Their music is marked by a fusion of electronic beats, catchy vocal melodies, and an energetic music approach that resonates with the contemporary idol culture in Japan.

CY8ER quickly became known for their vibrant and colorful image, cyberpunk aesthetics, and engaging live performances. Despite their relatively short lifespan, the group amassed a dedicated fanbase with popular releases like "endroll," "CY8ER," and "Go-syu-!" The group's style varied from the upbeat tempo of "ByeBye" to the more reflective "Summer / Sayonara Flashback," showcasing the members' versatility. CY8ER's discography is a testament to their evolution, with songs like "Time Trip" and "Dead Boy, Dead Girl" exploring different facets of electronic music. Though they disbanded in early 2021, CY8ER left a lasting impact on the idol scene and continues to be celebrated for their contribution to the genre.