I wasn't too sure about this ep, at first I was kinda disappointed that again, after #3, nothing really "happened". But in the end it just had to good of a feel to it, so I didn't care much for the slow pace after all (gave it a 9).
It kinda seems like the lull before the storm to me, I don't expect episode 5 to be another character-interaction-only-episode. And hopefully there'll be more of Matsuri again next time as well.