Clover (クローバー Kurōbā?) is a manga series created by Clamp, a creative team made up by Satsuki Igarashi, Nanase Ohkawa, Tsubaki Nekoi, and Mokona. The manga takes place in a dystopian future, where the government is out to control the "Clovers", a race of children with special powers.

A Clover animated music video directed by Kitarō Kōsaka and animated by Madhouse Studios was shown in Japanese theaters before the Cardcaptor Sakura film in 1999. The short film was released to DVD as part of the Clamp in Wonderland collection on October 26, 2007.
From Wikipedia: https://goo.gl/A8j7Ra

Character Designer and Animation Director for this music video was Nobuteru Yūki, one of my favorite artists.