X² is a music video anime, produced by Animate Film.

About the production: the story comes from a manga, there is 1 episode of about 7 minutes and its current status is "finished".

Its main genres are drama, with themes such as Shoujo and Anti-Hero.

On AniList, X² has an average score of 63%, an average score, and appears on 2,288 users' lists.

The franchise continues in or follows from: X.

X2 is basically a short prequel to the theatrical X film. It consists of four music videos. The first three are merely stills of CLAMP's pre-1994 X artwork, but the fourth is animated by Madhouse. Being the only music video that contains actual plot, the fourth video introduces some of the major characters and quickly lashes through the first few X manga (equivalent to X TV series episodes 1-3) which take place before the theatrical movie. (Source: Anime News Network)

Official synopsis from AniList.