you ppl shouldnt be lectureing ppl on anime >_>
there are 6 OVA's for kenshin
theres the 4 part OVA that was made 4 years ago, that was a prequal to kenshin, called reminsice, and it was the prequal to the kenshin 95 ep series, from 96, which had a motion picture called Requiem for the Restoration Royalists made a year after the series (97), and finally 2 years ago they closed the series down with a 2 part ending (01)
the prequal is jsut so that you know kenshins past and about his oath, but its perfectly fine to watch the anime before the 4 part OVA
OVA stand for Original Animation Video