To quote TV tropes:
The idea of becoming an overnight idol sensation is a bit ludicrous, but otherwise that doesn't sound like too bad a setup, and it apparently also contains a good deal of slice of life elements. On the other hand, it's seinen anime and it looks... well, it certainly looks the part.
Probably, and unlike... the other stuff, it's really almost entirely aimed at children, from what I recall. Ah, maybe at a later point. If only for a historical view on Miyazaki and Takahata's earlier/earliest collaboration.