Guitarist Sugizo cited "Rosier" as one of the songs he tried to replicate the "psychedelic feel of shoegaze bands" by using effects, "like playing fast with a wah-wah pedal, or using tape-echo and harmonizers. I couldn’t figure out how they did it, so I just made it into my own thing."

The fast spoken English words in the middle of the song were written and performed by J. As a staple of Luna Sea concerts, J throws his mic stand over his head and behind his back after finishing his vocal part.

This single version of "Rosier" is slightly different from the album's. An 8cm CD of a live version of the song was given away to winners of a magazine contest. Live versions also appear on the band's Never Sold Out and Never Sold Out 2 albums.

The music video for "Rosier" opens with the camera spiraling down on to a coffin, similar to the single's cover art, with roses on it covering the glass window at its head. The majority shows the band performing the song against a white backdrop with smoke flowing along the ground. Black and white and light blue filters were also used, as was slow motion. A dominant feature is the camera work; a crane takes the viewer over the band 180 degrees from the front of its members, ending upside down at their backs, the opposite is also seen. 360 degree shots around the band are also shown.

Close-ups of the band members against a dark backdrop, separated from the camera by florescent lights, which provide the shots' only light, are inter-cut. During J's vocal part, the English lyrics appear flashing over the video in a typed font. Instead of ending with the English phrase "I'm the trigger" as heard on the released track, the video's audio fades out while it climaxes with a shot zooming in to the coffin's supposed glass window and a hand reaches out grabbing the camera. However, the phrase is viewable in the video as it is written in red on the white drumhead of Shinya's snare drum and as font during J's vocals.

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Wikipedia