Rui Kamishiro is a lonely but brilliant inventor. His ideas and goals were not understood by many, so he lives in an almost deserted place. He had a lover - Tsukasa Tenma, who supported him in everything. But because of Rui, Tsukasa died, at least he thinks so. In the end, to drown out the pain, Rui tried to create a copy of him in the form of a robot and he succeeded after many attempts. But he still tries not to get too attached to the robot, because he is not a person. He has a photo of Tsuka