The term refers to a high-resolution (4K) version of a specific Japanese adult video (JAV) release. In this context, "SONE-060" is the unique identification "code" or "number code" (番号) used to catalog and find a particular film featuring actress Hikaru Nagi0;ba8; (凪ひかる). 0;16;

(e.g., a specific video production, a stock footage ID, or an adult cinema title?)

Kenji was mesmerized. This wasn't the genre he’d expected from the catalog number. This was cinema verité. A ghost story where the ghost was a feeling.