Suffering from a crippling memory loss ever since an accident at the age of six, Toshiaki finds new hope, and a new mystery, when he is visited by a girl from his own future.

Sequence

After ten years of dormancy, Linea awakes from a capsule in the countryside of Japan. Without any memories, she wanders into a small research center staffed by three beautiful women. One of the researchers, Sayako, is entranced by the strange woman and leaves her present lover. Sayako takes Linea to bed, and finds that her abilities are beyond that of any ordinary woman.