421: A Will

421: A Will

"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.