Pop duo Do As Infinity updated their official website with news on their upcoming single, "Chikai"!

The single will be released on July 27th and is available in two different versions: a CD-only "Do As Infinity" version and a CD+DVD "Sengoku BASARA" version, as the title track will serve as the theme song to the hit video game. "Chikai" has already claimed the top two spots on mu-mo's pre-order chart.

Check out the official track list for both versions below!

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< Do As Infinity Ver. Track List >
01. Chikai
02. Live track fromLIVE TOUR2011 ~EIGHT~ (TBA)
03. Live track fromLIVE TOUR2011 ~EIGHT~ (TBA)
04. Live track fromLIVE TOUR2011 ~EIGHT~ (TBA)

< Sengoku BASARA Ver. Track List >
01. Chikai
02. Chikai -Instrumental-
DVD: 'Chikai' BASARA original movie

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Source: Do As Infinity's Official Website & Blog