Aliens.

Rica, a woman who lost her memory is found by the lakeside. Staying with her discoverer Ataru, she wanders about the town seeking for clues to her past. While Rica gets back some framented memories, such as the experience as a hooker and her own pregnancy, Ataru, who secretly has a gender identity disorder, is roaming the town as well for the pursuit of his gender and sexuality. One day, Rica sees a vision of her memory in which she was almost killed by the lakeside and expects that the killer knows her past. These two drifters with a sense of loss undergo a gradual change...