Ai Kago
In 2001, simultaneously with her Morning Musume obligations, Ishikawa became a featured member of the then-semi-dormant Hello! Project pop group Country Musume and a second-generation member of Morning Musume's first subgroup, Tanpopo. She also participated in her first shuffle group, 3-nin Matsuri, with fellow Morning Musume/Tanpopo member Ai Kago and solo singer Aya Matsuura (previously, she had acted as a replacement member in the 2000 shuffle group Aoiro 7).