Otona ni Nuts 2 Anime Details and Episodes Niko-chan can turn from a 10-year-old into a 14--year-old student. You also shouldn't forget her best friend... Series info Watch free DetailsFormatMangaStatusFinishedSourceOriginalCountryJapan GenresComedyRomanceSupernatural TagsShoujoFemale Protagonist RelatedOtona Ni Nuts (Prequel) RecommendationsKimi no Neiro