Akutsu Eita is a loner and introverted mecha otaku.
Even he has a girl he secretly admires. That girl is the super beautiful, cheerful, and popular gyaru, Agatsuma Makina.
One night, Makina appears at Eita's front door. Acting somewhat strange, she suddenly bares her naked body.
What was there was a body different from a human's—it was mechanical!
Makina is an AI robot created for erotic purposes but has access restrictions on adult information.
Eita is a naive virgin, overly pure when it comes to women, and endlessly kind-hearted.
Thus begins their cohabitation life, where revealing her mechanical nature is strictly forbidden!