Set within a small detective agency located along the riverside of Sumida River in Asakusa District, Tokyo. At the detective agency, there are 3 employees: researcher Muraki, the head of the detective agency and reception clerk Megumi, who has a bright personality. They receive requests that even they think are nearly impossible to perform, but they try to find a solution by carefully approaching their clients, the people around their clients and whatever is hidden in the background. ~~ Adapted from the manga series "Ribasu Ejji Ookawabata Tanteisha" by Yuho Hijikata and Akio Tanaka.