Eita, a mechanical otaku, discovers that Makina, the school idol he's secretly liked, is actually a robot built for sexual purposes. Now, he must navigate her bold advances while helping her keep her identity hidden in this chaotic romantic comedy.
Makina, whose mechanical identity must remain a secret, frantically calls Mamimi from her apartment to explain away the commotion caused at school. During the call, she starts making odd sounds due to Eita's ongoing maintenance, but somehow manages to keep her cover until the end. Just as things settle down, a mysterious girl suddenly appears at their apartment...
