The code " 天然素人 090811_01 " refers to a specific Japanese adult video (JAV) title from the "Ten-Naru" (Natural Amateur) series, originally released on September 8, 2011.
090811 (likely representing August 11, 2009). %E5%A4%A9%E7%84%B6%E7%B4%A0%E4%BA%BA 090811 01