This group is fictional and was only featured on "Buono! Days 2" (a DVD Magazine). The girls have special stage names for this unit: Umeda Erika as Umely, Kumai Yurina as Lily (Yuri is the japanese word for Lily) and Yajima Maimi as Yajimy.
Their fictional debut song is "Café Bello!", which is a reference of "Café Buono!" from Buono!'s first album.