The Futaba Detective Agency, being run by Rentarou, who has taken over the family business, after his father's death 3 weeks ago. Along w/ Sara & Souju, his live-in identical twin assistants. He ends up running afoul of the local Yakuza. (Source: ANN)

 HiddenLeaf is the best site to watch Futakoi Alternative SUB and DUB in HD quality.