Edouard Mercier is a thirty year old man living in Japan since his transfer, in the new technologies sector. Since he moved to Japan, he has been struggling with depression and loneliness in this new city where he finds himself alone.
The engineer Hayato Takumi, his office colleague, offers him to be a guinea pig for one of his first inventions. He has imagined a machine capable of reading buried dreams, thanks to sensory sensors.
Edouard Mercier revisits his dreams, however, the nightmares he slept through resurface. One of them in particular, that he had as a child, disturbs him, which pushes him to return to France to solve this mystery. Were the nightmares he had as a child a reflection of those forgotten years ?