im glad you gave it a try and im glad you liked noct! i hope you enjoy carol's route!
in order to get the romance endings, you're gonna basically have to do a little roleplaying. you have to pick the choices that fit with jazz's character, and, well. she's an overdramatic tsundere. if she doesn't start screaming over valentine's chocolates being embarrassing, she doesn't see the boy as a love interest. you'll know you're on the right path if she calls carol cute or noct's smile blinding.
also, the very first choice determines whether you're on noct's route or carol's route. there's very little overlap between the two choices.
i'm glad you liked it! again, i hope you enjoy carol's route! thank you so much for your comment!