Scientist Nakasaki Yukine is conducting a human cloning research project. His experiments focus on producing offspring between humans and cloned humans. One man agrees to participate in an experiment involving copulation with a clone created from his own DNA—clone "Yukine." Though aware of the risks, the man follows instructions and proceeds with intercourse. Afterward, however, he feels unsettled, sensing a difference between clone and human—he notices "the warmth of her skin feels different." Seeking to confirm this sensation, he also engages with researcher Nakasaki. This work is an experimental record depicting emotions, conflicts, and the limits of science arising between cloned humans and natural humans.