"Kurenai" () is a ballad from X Japan's 1989 album "Blue Blood". The song was written by Yoshiki, the band's pianist and primary composer, and features lyrics by Vocalist Toshi.

The song's title, "Kurenai", roughly translates to "Crimson" or "Deep Red", which symbolizes the intense passion and love expressed in the lyrics. The song's narrative revolves around a person struggling to come to terms with a lost love, with the "crimson" color serving as a metaphor for the all-consuming emotions.

"Kurenai" has been a staple of X Japan's live performances throughout their career. The song is often performed during the encore, with the band's elaborate stage sets and lighting adding to the emotional impact.

The song's live performances are notable for their intense, cathartic quality, with Yoshiki's piano playing and Toshi's vocals creating a sense of shared emotional release with the audience.

The song's influence can be seen in many subsequent Japanese rock ballads, with artists often citing X Japan as an inspiration. "Kurenai" has also been covered by numerous artists, including other Japanese rock bands and classical musicians.

"Kurenai" is an iconic song in X Japan's discography, showcasing the band's mastery of symphonic rock and balladry. The song's timeless themes of love, longing, and heartbreak continue to resonate with fans worldwide, cementing its place as one of the band's best and most beloved songs.