Vulgar (stylized VULGAR) is the fourth studio album released by Dir en grey on September 10, 2003 in Japan and on February 21, 2006 in Europe. A limited edition containing an additional DVD was also released. It featured the video of the song "Obscure", albeit a censored version (the uncensored clip was later released on the Average Psycho DVD, and has since become notorious and earned the song huge popularity). Vulgar is the first Dir en grey release not to feature individual credits for the music, though the accompanying singles featured individual credits.
"蝕紅" offers several ways of romanization, namely "Shokubeni" and "Syokubeni" (a variation utilizing Kunrei-shiki romanization). "Syokubeni" was once used on Dir en grey's official site, although mention in most other media (including release booklets) the Hepburn romanization style is used, giving the title as "Shokubeni".