This may make me shallow, but I really do prefer some storyline or plot to my movies. This movie has excellent characterization, but after being introduced to these characters, we mostly watch them wander aimlessly around Tokyo, dealing with culture clash and difficulties in communicating.

Yes, situations and relationships like this happen in real life - but then, so do relationships in which people smile at each other in checkout lines. Interesting, but not worth making (or watching) a movie about.

Good performances, great characterization, nothing for those characters to do but kill time in Tokyo.