I want the two of you to have sex. ~~ Rika Utsumi, a fourth-year working adult, was living a peaceful, uneventful life. Reiji Kobayashi, a handsome but aloof and cool man, was popular with the women at the company, but his unapproachable nature kept them at a slight distance. Rika, who found Kobayashi a bit difficult, thought she would never have to interact with him outside of work. One day, she is summoned by a mysterious government agency and learns that her and Kobayashi's genes are a perfect match. The agency is researching a system for matching men and women using genetic information. "I want you two to have sex." The two are bewildered by the sudden and outrageous request. However, upon learning the heavy secret Kobayashi is carrying, Rika resolves to take action in order to help him...