Aikatsu Planet is definitely a unique form of media as it is a hybrid of both real life acting and anime. The way it works is that the idols in this world can enter a virtual world where they perform their 'Aikatsu' (a combination word made from both Idol and activities). It may seem unappealing but I found it to be interesting as being able to put a face to the singer and because of the difference between the worlds it makes it easy to understand the double life that Mao (main MC) deals with. From a 'no knowledge' about Aikatsu perspective, I would say tocheck out the first episode to get the gist of it's for you. You do not have to see the past Aikatsu series to understand this one. The main demographic is for children so it's easy to understand, is bright and colourful, and has good music.

From an Aikatsu fan I think that even though they changed a lot about the system, it still has the Aikatsu vibe from it. Mao is a natural idol with her dance background and great personality. What makes this a bit more interesting (minus the new hybrid mode) is that there is the overarching plot/ mystery of Hana's past owner and her trying to live up to that expectation. No one knows that she's Hana but she has to live up to that.

Understand that this isn't meant to be a serious type of anime but one that you can just enjoy. They are trying something new with a well established brand and I'm all for it.