Arisu is an aspiring writer who occasionally requests assistance from the "Rental Gentleman Service", a group of gentlemen who help escort and protect young ladies in need. But one day, the elder "Nagasako-san" who's usually assigned to her ends up hospitalized, and sends his nephew Haruka to guard Arisu in his place. Haruka instantly falls in love, and thus begins his relationship with a "quirky" Arisu...