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Wikipedia article
"'Cocoon'" is the seventh single of singer Anna Tsuchiya. The single was released by Mad Pray Records on 30 January 2008 in two versions; as a regular CD and a limited edition CD+DVD version. The song spent four weeks in the Oricon charts, reaching #19 on 11 February 2008. "cocoon" was used in a NTT DoCoMo television commercial, while the B-side "U" was used as the campaign song for the DVD release of 'The L Word' in Japan. The third track, "Guys", was not included in the limited edition version.