Heart no Kakuritsu

 (ハートの確率; Chances of the Heart) is the second single by blue drops. It was released on November 10, 2010, and peaked at #22 on the Oricon single chart.

Single Information
The lead track Heart no Kakuritsu was used as the opening theme for the anime Heaven's Lost Property: Forte, while Kaeru Kara was used as the ending theme.
 * Catalog Number:
 * COCC-16419 (Regular Edition)
 * COZC-473/4 (Limited Edition)
 * Lyrics: Iwasato Yuho
 * Composition: Koga Tomoya
 * Arrangement: Kusano Yoshihiro

Tracklist

 * 1) Heart no Kakuritsu (ハートの確率; Chances of the Heart) (Main Vocal Hitomi)
 * 2) Heart no Kakuritsu (Main Vocal Saori)
 * 3) Kaeru Kara (Piano Version) (帰るから; Because I'll Return)
 * 4) Heart no Kakuritsu (Instrumental)
 * 5) 帰るから (Instrumental)