Riri receives a package on her birthday from her late husband – frozen sperm in a test tube. She deeply grieves over his death, and then she moves to an old house in the countryside with the frozen sperm and her theremin. A young man, Wataru, shows up at her house. He is seemingly interested in the old and traditional house and aims his camera at it, but his true aim is to steal the sperm. While he is waiting for the opportunity, he hears beautiful and plaintive sounds which are generated by Riri’s theremin performance.