Teardrop or Tiadoroppu, is the Japanese opening theme to the Yu-Gi-Oh! GX Duel Monsters anime series. Both the lyrics and music composition are created written by Maruyama Kazuhiro while the actual song is sung by a Japanese group called BOWL. version one debuted in Japan on October 4, 2006 while version two debuted on April 11, 2007.

The first version of this song replaced 99% in Episode 105. The second version of this song replaced the original in Episode 131. It was followed by Precious Time, Glory Days for the fourth season.