The keyword "star409 risa tachibana av debut akb member takamatsu eri" persists because it is a mystery that satisfies both the prurient and the scholarly. It is a puzzle where the final piece—an admission—will never be printed.
For the uninitiated, this looks like a random collection of data. For the dedicated follower of Japanese entertainment, it represents a digital ghost—a speculation trail linking a specific AV serial number, a pseudonymous actress, and a former idol from Japan’s most famous girl group.
A birthmark/mole on the right clavicle (collarbone), visible in low-resolution AKB48 Kenkyuusei photos, appeared in the exact same location in high-definition screencaps from STAR409. This is nearly impossible to fake.