Betty & Co.

From the introduction:

The start of “Betty” cartoon series began off with the events near the end of April 1968 as the networks worrying too much about ‘superheroes’ cartoons — some from the comic books and other from studios—such as Tam-Fruit and their rivals. Surprising one of the biggest animation successful stories wasn’t a superhero comic but a gag comic about a high school student called “Amy Anderson” from “Amy Comics.” AMBO asked if they could come up with something different from “Amy”. Thomas Tamma decides to make a mystery series featuring a group of teenage rock and roll starlets that get caught up in the spooky monsters.