Onyanko Club was a pioneering Japanese idol girl group that formed in 1985, under the production of Yusuke Nakagawa, with music direction by Akimoto Yasushi, who later became renowned for producing the mega-group AKB48. The name "Onyanko" roughly translates to "kitten club" in English, a nod to the youth and energy of the group members, whose ages ranged from early to late teens. The group's concept broke new ground, combining a rotating cast of members with a reality TV approach, as the formation and various activities of Onyanko Club were featured on the popular television program "Yuuyake Nyan Nyan."

The group quickly achieved immense popularity with a string of hits, characterized by catchy pop tunes and relatable lyrics that resonated with the school-aged demographic. They were known for their lively performances and the school uniform costumes that became their signature look. At its peak, Onyanko Club had as many as 52 members, featuring a dynamic system where older members would "graduate" and new members would be added. Despite their short-lived activity, with disbandment in 1987, Onyanko Club has left an indelible mark on the J-pop industry, influencing the format of many future idol groups. Post-disbandment, "Yume Catalog + Single Collection," "Shoumi Kigen," "Side Line," and "Kick Off" stand as compilations and re-releases of their most popular work, allowing fans to reminisce and celebrate the legacy of this iconic ensemble.