It is the time of Taisho. Morisaki Shinichirou and his step-sister, Morisaki Kotomi run a cafe that their month ran before she passed away. Life was peaceful and quiet in their little town as brother and sister worked hard to earn a living.Their father, a top scientist for the empire, was working on a secret project creating sex androids. But one day, an accident occurred at his lab that released an android girl into the public. Get ready for a raunchy time now that Arisa the Android is on the loose!