If you are a collector or researcher, these codes are the most efficient way to organize digital libraries.

These strings help users ensure they have the official version of a release rather than a fan-edit. If you'd like, I can help you find: A more detailed biography of Reona Kirishima.

This is the product code or "ID." In the Japanese media industry, major studios assign these alphanumeric codes to every release.

The string "dasd542 reona kirishima020140 min" appears to be a specific technical identifier or a database entry related to adult media metadata, specifically referencing a performer and a duration.