At 27 years old, Hayami is an ace when it comes to her work, but at home she becomes a massive slob. It just so happens that Yamamoto-kun, her junior who carries a bit of a torch for her, is a pro at housework! Smitten with his domestic prowess, Hayami takes him in as her wife, and their life as housemates begins. Finally together after realizing that their unrequited love was not so unrequited after all, the two become a couple, and Hayami's heart is pounding non-stop from all the innocent intimacy they've been sharing. But when a cute new guy named Hanazuma-kun joins the company, Yamamoto feels the flames of jealousy stirring...