If you are looking for music by the former Japanese pop artist of the exact same name (who also performed as Rika Himenogi), stick to safe, officially licensed streaming channels such as verified YouTube channels or legitimate music services.
If you're looking for inspiration or resources related to Rika Nishimura, here are some ideas: rika nishimura zip
(optional, but handy if you’ll share the file). If you are looking for music by the