Ai, Sei Anime Details and Episodes Sei, a salaryman only interested in strictly sexual relationships gets hooked on the handsome Ai, who is 16 years his junior. Initially, they resolve to… Series info Watch free DetailsFormatOne shotStatusFinishedScore58/100SourceOriginalCountryJapan GenresRomance TagsBoys' LoveAge GapMale ProtagonistPrimarily Male CastPrimarily Adult Cast RelatedI SAY (Related) CharactersAiSei