Kiyoharu is a man who enjoys a calm and predictable everyday life, but his routine comes to an abrupt end when the daughter of his best friend suddenly appears on his doorstep. Without warning, she declares that she will be moving in with him and demands that he make her his wife. This forceful proposition creates the central conflict of the story, as Kiyoharu finds himself navigating the complicated and often comedic situation of living with a young woman who is both his best friend's child and a relentless romantic pursuer.

The main character is Kiyoharu, an ordinary man whose peaceful existence is turned upside down by the arrival of the girl he once knew as a child. The female lead is his best friend's daughter, whose name is not provided in the summary, but she is characterized by her bold and determined personality, having matured from the child Kiyoharu remembers into a young woman with a singular romantic goal. The setting appears to be contemporary Japan, primarily taking place within Kiyoharu's home, which becomes the stage for their daily interactions and the resulting chaos.

The narrative follows a romance comedy structure, unfolding as Kiyoharu struggles to handle the assertive advances of his best friend's daughter while she weaponizes her living situation to get closer to him. The story explores the awkward tension between his sense of propriety and her unwavering pursuit. The manga is complete, spanning five volumes with a total of thirty-seven chapters published between March 29, 2019, and July 8, 2024. While specific arc titles are not detailed in the source material, the overall plot likely progresses from the initial shock of her arrival through various comedic scenarios and romantic developments, eventually leading to a resolution of their unusual relationship dynamic.