Yuu Hasegawa (長谷川優), known professionally as Aika Miura (三浦あいか), born November 2, 1975 in Kanagawa Prefecture, Japan, was a Japanese pornography model and actress, now apparently retired.

Often cited as one of the most popular of AV (adult video) actresses in Japan active in the 1990s, she is widely admired throughout the world due to the wide internet distribution of her still photographs, screen-captures, and film and video work. Many of these, not atypically for the JAV industry, were particularly devoted to bondage, S&M, and simulated rape imagery; not a few of these images are also devoted to anal-sex–related activities and suggestion (presumably to allow and highlight the display of another orifice in lieu of her genitals or pubic hair, in some instances).

 The Internet Fuck (1996)