421: A Will

"421-a will-"
Single by Kotoko
from the album Garasu no Kaze (A-side) Uzu-Maki (B-side)
B-side	"Shuusou"
Released	October 13, 2005
Format	Maxi
Genre	J-pop, pop-rock, electronica
Length	21:38
Label	Geneon
Songwriter(s)	Kotoko
Producer(s)	I've Sound
Kotoko singles chronology
"Radiance / Chi ni Kaeru: On the Earth" (2005) "421-a will-" (2005) "Being" (2006)
"Radiance / Chi ni Kaeru: On the Earth" (2005) "421-a will-" (2005) "Being" (2006)

"421-a will-" is Kotoko's fourth maxi single under Geneon Entertainment. The title track was used as a TV commercial song for dwango's Iro Mellow Mix (いろメロミックス) and the opening theme for Pocket Radio's Kotoko to Tokotoko Tankenki. The B-side, "Shuusou", is the ending theme for Kotoko to Tokotoko Tankenki.

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Wikipedia