Futakoi Alternative Anime Details and Episodes Futakoi Alternative tells the story of Rentarō Futaba and his detective agency. One day a set of twins, Sara and Sōju, show up at his doorstep.… Series info Watch free DetailsFormatMangaStatusFinishedSourceAnimeCountryJapan GenresComedyDramaRomance RelatedFutakoi Alternative (Alternative) CharactersSara ShiroganeSouju ShiroganeRentarou Futaba