"Kitty to Mimmy no Happy Birthday" is a Sanrio short for kids starring Hello Kitty and her twin sister, Mimmy. This OVA is decent enough for what it is; it's harmless, easy to watch and has a clear beginning, middle and end. It's not particularly worth watching, though. The gist of the story is this: it's Kitty and Mimmy's birthday, and their mother sends them off to pick yellow strawberries for their birthday cake. They invite various friends to accompany them, but everyone is too busy! Dejected, Kitty and Mimmy pick the berries themselves, then get lost, and finally find their way home, where a surprise(and a song) awaits...

The plot is predictable, so the real point of watching this is to see all of the other Sanrio characters that appear in it. Cameos run the gamut from famous characters such as My Melody and Little Twin Stars, to relatively minor ones such as Taabou and Pokopon.

The animation is limited, but serviceable. The voice acting is average. The music, including the song at the end, does not leave much of an impression.

Overall, this is not a bad short by any means, but there is nothing particularly unique or outstanding about it. It's rather mediocre and I would recommend it only to Sanrio fans.