I've enjoyed the last 3-4 movies from this director but this one was a misjudged sappy convoluted mess.
It tried to marry the world of idol performers (a manufactured and manipulated and notably shallow world of selling music based on looks and marketing) to the struggles of youth in the modern world, and it just won't fit unless you turn off everything you know about social media, and manufactured entertainment. For a director who's made some smart and insightful dramas this one misses its target in the big picture although many of the details that make his previous films worthy are still here.
There is a lot of japanese small town and city details that are rewardingly accurate and familiar. The images are fantastic (not photos as another reviewer criticised the film for, but just really good animation).
The characters when they're not spreading on the cheese are more well rounded japanese people, until they're shifted into cliche, but they switch between the 2 regularly.
It's like the film was directed by two directors, one making quality anime and the other making a greasy cheese sandwich. The end result is an uneasy mixture of the 2, and unfortunately the cheese is the overpowering taste left in ones mouth. I don't know what he was aiming for with this film but he made a move into hollywood and authentic japanese culture loses in that game.