START-425 "MINAMO-san, we're a married couple, right?!" MINAMO, an investigator who has been devoted to her work and hasn't had sex for three years, pretends to be married to a male subordinate, and they end up having sex for real. A one-week investigation record of her transformation from investigator to woman.

A strong-willed female detective, devoted to her work, goes undercover with a male detective who is a junior colleague, posing as a married couple. They end up living in an apartment next to a Yakuza house. To conceal their true identities and make it seem like they are a real married couple, the two live a fake newlywed life. What was supposed to be a mission-related act eventually shakes her heart, and she falls in love with her junior colleague.