This is a music video done by CLAMP that features a bunch of their characters including those from xxxHolic, Tsubasa, Cardcaptor Sakura, Magic Knights Rayearth, Kobato, Chobits, Clover, Wish, Angelic Layer, X, and others. While hard to rate, I overall enjoyed the video.
The plot, if you can even call it that, is the two Mokonas running around the different dimensions, running into all the characters. Unlike the first music video, this one has a bit more flow between the scenes. The animation is beautiful and the music is catchy, so it's a nice watch. It is also a fun way to learn about CLAMP titles I haven't heard of before. It was a nice improvement over the first music video, which was a bit more dull.
It is just a music video, so it's a bit hard to rate it properly. I will say CLAMP fans will enjoy it much more than non-CLAMP fans for sure, as to non-fans it's basically a catchy commercial. However, as a CLAMP fan, I really enjoyed it. As a music video, I find it pretty good, although not as great as some other anime music videos that have a plot.