Pet Robot Lilly 3
English title: Pet Robot Lilly 3
Japanese title: 愛玩ロボット リリィ３
After his girlfriend dumps him for another girl, our protagonist buy a sex robot (model Lilly) after drinking his sorrows away. Next day, his (now ex-) girlfriend comes back to find Lilly hanging around him.
Suddenly, a love polygon is created between one guy, two girls and one sex robot. Sex robot ends up working a lot.
*All characters depicted in this work of fiction are adults, regradless of their visual representation or textual description and are not based on any real person*