Kou Ichinomiya, a twenty-year-old student, has always adhered to his prestigious family's principle of avoiding indebtedness. However, a perilous situation changes everything when he is rescued by a self-proclaimed Venusian named Nino. Now, Kou finds himself owing a debt not just of gratitude but also of love, as Nino insists they live together beneath the Arakawa River bridge. As Kou navigates this unexpected arrangement, he encounters a motley crew of eccentric individuals from the riverside community, each adding a unique hue to the already colorful tapestry of life under the bridge. From the whimsical Village Chief who bestows upon him the moniker 'Recruit' to the seemingly gentle yet secretly sadistic woman overseeing an animal sanctuary, Kou's journey under the bridge is a whimsical and unpredictable adventure where the line between reality and fantasy blurs.