"Yakusoku" (約束? Promise) is an image song single for the Clannad film by Lia originally released at Comiket 72 on August 17, 2007, produced by Frontier Works. The music CD was only available to those who bought film tickets early for the Clannad film. The single contains four tracks, with only the first song "Yakusoku" sung by Lia while tracks two and three are background music from the Clannad Film Soundtrack, and the final track is an instrumental version of "Promise".

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