Mirror is a visual novel with elements of a Japanese-style adult dating simulator. One day a young man notices a small store called "Mirror". Upon entering, he meets a strange woman who calls herself Heine. She shows the young man a doll that looks like a beautiful young woman and asks him to touch it. Immediately after this, the hero finds himself in the hospital with amnesia and encounters an unknown woman who looks exactly like the same doll. Now the guy has to get to the bottom of the truth and separate fiction from reality.