Terada is recruited by a Genetic Research Center to be a sperm donor due to his superior genetic quality. Refusing to provide samples via containers, he negotiates a unique contract to donate through direct sexual intercourse. After a successful first encounter with a nervous client, Terada discovers that his services are highly effective, leading to repeat requests from women desperate to conceive.
Terada reunites with Kumi, noticing a drastic shift in her attitude as she begins to embrace the pleasure of their encounters over the mere goal of conception. When Kumi returns months later to reveal she is already pregnant with his child, she confesses her longing for him and requests one final, unrestrained session of passion to satisfy her desires before ending their arrangement.