Naoko comes home from shopping, only to find that Tarou has cheated on her with his old 2.nd generation onahole.

College student Tarou has found and purchased the next-generation human-type onahole. A sex android that looks just like his childhoods next door neighbour. A girl he longed to play with in the past. The onahole, named Naoko, was delivered on the same day, and immediately connected to a PC and started, but what... an error message is displayed ...!? Setup failed!