It seems you are referring to the Japanese adult video (JAV) title starring the actress Ririka (possibly Ririka Hoshikawa or another performer using the mononym Ririka, depending on the release context).
NSFS-138 Born De M Ririka Best appears to be a specific reference—likely a product code or production identifier—associated with NSFS-138 Born De M Ririka Best
“Where am I?” Ririka asked, her voice a blend of synthetic resonance and a faint, melodic timbre that seemed to borrow from the wind. It seems you are referring to the Japanese