"Week End" is a single released by X Japan (then named X) on April 21, 1990.
Differences between this single edit and the album edit, found on Blue Blood, include an alternate guitar solo and an additional piano bridge. The B-side is a live performance of "Endless Rain" recorded on February 4, 1990, at the Nippon Budokan. A live performance of "Week End" was included as the B-side of their 1996 single "Crucify My Love".
The song reached number 2 on the Oricon charts, and charted for 16 weeks. In 1990, with 291,440 copies sold was the 32nd best-selling single of the year, being certified Gold by RIAJ.