Sure,Tokyo Babylon introduces 3 of the main characters of X/1999(Subaru,Hokuto,and Seishiro),but saying that it's a sequel to the dreadful X/1999 movie is an overstatement since TB had a far better plot.OTOH,the X/1999 TV series looks promising even after only 4 episodes(including the OVA "episode zero");and I'll probably watch episodes 4-6 before bedtime...