Eichi's father left behind an unfinished sexaroid which Eichi then tried to complete building.
He built her to be a girl and named her Mami. After starting her up Eichi tried to teach Mami all kinds of sexual techniques, but Mami was so full of glitches that everything went badly. But even so Eichi didn't give up and started to fall deeply in love with her. But then sudden an old friend of Eichi's named Miyako shows up. What will happen now!?

[From dlsite]