Ningyo Tsukai / Robosex

Hentai is based on the same-named adult game from studio Forest Inc. (株式会社 フ ォ レ ス ト). 

Silhouettes are robots that are controlled by people using special virtual devices similar to modern helmets. These robots were created to help humanity, but once perverted and greedy people gained access to them, everything changed. Silhouettes became very dangerous and sex crimes began to rise. Rika and Sandy are two scientists on "Silhouettes" who are called to find and neutralize criminals controlling a part of sexually depraved robots.