Koyama Asako(小山亜沙子)

Asako Koyama is a Japanese Adult Video (JAV) actress. Based on available information, her career appears to have begun around 2016. While information is limited, the provided title suggests a focus on mature women ("jukujo") and married women ("hitodzuma/shufu") themed content. The tags associated with her work, such as "midashii," "anal," and "restraint," indicate a leaning towards niche fetishes within the mature genre. The series title "熟妻の交尾" (Jukujin no Koubi - Mating of Mature Wives) also gives a clear indication of the type of content she is usually featured in. Her presence is largely associated with Jewel, the studio that released the work mentioned. It is difficult to determine the extent of her filmography or any significant genre evolution without a more complete list of her works. However, based on the available information, she appears to be an actress whose work caters to a specific preference within the JAV market. In summary, Asako Koyama seems to specialize in mature-themed JAV, specifically focusing on the "jukujo" and "hitodzuma" genres with an emphasis on fetishes like anal and restraint. Her career likely began around 2016 and her presence is primarily associated with the Jewel studio.