Being that there is no color in She and Her Cat adds to the OVA rather than ruins it. This could've happened because of the popular belief that cats see in black and white (they really see in color), but it really makes this 5 minute story stand out that much more. There are many freeze frames in the OVA, with the most animation coming from the background images, but this makes the story more involved and focused on and therefore it seems to fit the mood.
As with the simple, but highly detailed animation comes the sound. Chobi's voice is constant in this OVA; he gives his side of his conversations and tells everything from a narrative point of view other times. There are a few other sounds such as sound effects, but the soft background songs in it are great and soothing.
There are just three characters in this: Chobi, She, and Mimi, the cat that Chobi dates in the summer. The unamed girl She is shown as a lonely person who's only true friend in life is Chobi. While Mimi, on the other hand, is a cute kitten who wants to marry Chobi. Chobi disagrees; he thinks it is a false promise due to her just being a kitten and that he loves the more 'adult' woman instead.
Overall, She and Her Cat was delightful. Very rarely can you tell a great story in just 5 minutes, but Makoto Shinkai pulled it off very well for being his first project. While maybe a little rushed, it was still a wholesome work of art. It's short, it's sweet (yet dark on some levels), and it has just a bit of innocence everyone needs once and awhile. And even if you think you won't like She and Her Cat, just try watching it once. 5 minutes is all you need.
