When Syaoran, Kurogane, Fai and Mokona from Reservoir Chronicle: Tsubasa (2005) visit Kobato's universe they are voiced by their actors from the series, Miyu Irino, Tetsu Inada, Daisuke Namikawa and Mika Kikuchi. Ioryougi even comments on Kurogane's voice as they are both played by Inada.