"Kamen/Mirai Kōkai" is Tackey & Tsubasa's fifth single under the Avex Trax label.

The first a-side song "Kamen" was used as the theme song for the Japanese version of the movie Mask 2.

The other a-side song "Mirai Kōkai" was used as the ending theme song for the anime One Piece.

Sample of Kamen's translated lyrics: I'll be a flower of the summer flames Putting on a golden, golden mask Taking in the sun straightforwardly With dazzling eyes, dazzling eyes, and passion that stabs the sky Someday, I'll be the sky So that I can bluely, bluely dissolve If I continue to believe in a new world, in my heart, in my heart The lies, sadness, and clouds will clear away[1] May 6, 2005 - Music Station Oricon Sales Chart (Japan) As of June 2005, "Kamen / Mirai Kōkai" has been certified gold for shipments of over 100,000 by the Recording Industry Association of Japan.

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