Ria is a girl who has become a shut-in after losing her parents. Her only best friend also decides to move overseas... Just as she is about to fall into the depths of despair at the news that she will be left alone... she is told about custom-made bionic robots. Ria asks for a robot that looks like her best friend's older brother, who she has always been interested in as a man... and becomes addicted to sex every day. However, the robot... "Ria... the truth is... I'm being taken away..." The shut-in girl, having discovered a sliver of happiness, tries to face the despair, but...