Loved the ED from the start!
I wasn't too hot on the OP at first, knowing the plot it struck me as far too happy and energetic.
But I've realised it's a good fit for this first cour, which we'll soon remember as the "good old times". And I love the visuals, the "diarama" style character shots. The following shots that manage to tease almost every character of importance giving them just a few frames each.
I'm really looking forward to a new OP/ED for the second decidedly darker cour.