Hasegawa Mayumi(長谷川まゆみ)

Hasegawa Mayumi is a JAV actress who debuted around 2012, judging from available work information. While a comprehensive filmography is unavailable, she appears to have maintained a career for at least a period of time following her debut. Based on limited title information, Hasegawa's early work seems to focus on niche themes involving pregnancy and instruction. Keywords such as "受精" (fertilization), "妊娠" (pregnancy), "中出し" (creampie), and "ハメ撮り" (self-shot) appear, suggesting a focus on these specific areas within the JAV landscape. The inclusion of "巨乳" (large breasts) and "水着" (swimsuit) also indicates that she was marketed with an emphasis on her physical attributes. It's difficult to determine any significant genre evolution based on the restricted data. However, her work seems primarily centered around the aforementioned themes, released by studios like Toyohiko. Without access to a wider range of her films, it's impossible to determine if she branched out into other popular JAV genres over time. In summary, Hasegawa Mayumi is a JAV actress notable for her work in the early 2010s, particularly focusing on themes related to pregnancy and fertilization, released primarily by Toyohiko. Her style seemingly involved a combination of niche themes and physical attributes.