This takes place fiften years after Zero Girl One . Tim has a daughter now, Nikki, about the same age as when he first met Amy. She's also about as messed up as Amy was, and that's saying some. Like then-Amy, Nikki has a lot of questions about her emerging sexuality, but they're very different questions than Amy's ever were. Her friend Rat (as if Nikki could have real friends) probably has the answers, but Nikki's not asking her.
It turns out that Nikki is pretty special, too, as special as Amy ever was. Somehow, Amy reappears, and acts as the Nikki's counselor, or big sister, or guardian angel, or some such. That guard thing helps when Nikki's deceased mother shows up. I mean, most teeangers have trouble with their parents but this relationship really needs work - she wants to connect with her daughter, but she's just such a square.
The first Zero Girl had visual style, novelty, and flair. Although the visual style is a good as ever and the sttitude is there, the flair somehow flamed out.