The song was used as the theme song of PlayStation 2 survival horror game Fatal Frame II: Crimson Butterfly.
The lyrics of the song tie in with the main themes of the game, and the PV was shot using similar imagery to that seen in-game, including crimson CG butterflies, which can also be seen on the cover.
The song was also included on Catalog, Amano's "best of" album.
"Chō" itself is filled with emotional vocals and is slow in tempo; following the tradition of her other singles, the B-side is a parody of the titular song and has more of a "pop" feel.
[2] All tracks are written by Tsukiko Amano This 2000s Japanese single–related article is a stub.