The Heaven's Divide / Koi no Yokushiryoku Single is a maxi-single released to promote Metal Gear Solid: Peace Walker. It was released on April 7, 2010 in Japan under the catalogue number GFCA-216. It contains two main songs: "Heavens Divide" (by Donna Burke), the main vocal theme for Peace Walker and "Koi no Yokushiryoku," a character image song for Paz Ortega Andrade sung by Paz's seiyū, Nana Mizuki. The cover album for the song also depicts her uniform as being removable so that, if the buyer so desires, they can have the cover album of Paz in her underwear.